in this study, 90% of gas stoves emitted at least mol/hr nox. give your answer as a numerical value (rounded to a whole number, no text).

Answer:

remain at rest

Explanation:

Answer:

It is only student A

Explanation:

I just took the quiz and got a 100% good luck to whever is reading this.

Student A has drew the correct Lewis dot diagram.

The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure. It is used to demonstrate how the electrons in a molecule are positioned around particular atoms.

Electrons are shown as "dots" or, in the case of a bond, as a line connecting the two atoms. The octet rule and formal charges must be met in order to achieve the "optimal" electron configuration.

Lewis electron dot structures, Lewis dot diagrams, and electron dot structures are a few names for Lewis structures. All of these titles allude to the same type of diagram that is used to depict the positions of bonds and electron pairs.

Therefore, Student A has drew the correct Lewis dot diagram.

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1. Hydrohalogenation: In this reaction, an alkene reacts with HI (hydroiodic acid), and the hydrogen (H) from HI adds to one carbon of the double bond, while the iodine (I) adds to the other carbon. This results in the formation of an alkyl iodide. The addition follows Markovnikov's rule, which means that the hydrogen will attach to the carbon with more hydrogen atoms, while the iodine will attach to the carbon with fewer hydrogen atoms.

2. Nucleophilic substitution: When HI reacts with an alkyl halide, the iodide ion (I-) from HI acts as a nucleophile and replaces the existing halogen atom on the alkyl halide, resulting in the formation of a new alkyl iodide.

To summarize, the two major organic products of the reaction involving HI as an HX reagent are:
1. Alkyl iodides formed through hydrohalogenation of alkenes
2. Alkyl iodides formed through nucleophilic substitution of alkyl halides.

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Answer:

:)

Explanation:

Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds.

Answer:

H2O

Explanation:

Thats the formula :P

At a pH of 4.0, the environment would be acidic and the histidine residue would be protonated because the pH is lower than the pKa of its functional group (which is approximately 6.0).

The ionisation state of amino acid residues, particularly histidine, can be critical for enzyme performance. The histidine residue's protonation status can alter its capacity to interact with other residues or substrates in the enzyme's active site. As a result, a histidine residue in an enzyme at a low pH of 4.0 would most likely be protonated, altering its catalytic characteristics and perhaps affecting the enzyme's overall activity.

Amino acids are chemical compounds that are used to construct proteins. There are 20 different amino acids found in proteins, each with its own side chain that defines its chemical and physical properties.

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Answer: 2.576 G

Explanation:

To determine the remaining amount of strontium-90 after 84 years, we need to consider its half-life. The half-life of strontium-90 is approximately 29 years.

Using the radioactive decay formula:

Amount remaining = Initial amount * (1/2)^(time elapsed / half-life)

We can calculate the remaining amount as follows:

Amount remaining = 10 g * (1/2)^(84 years / 29 years)

Amount remaining = 10 g * (1/2)^(2.896)

Amount remaining ≈ 10 g * 0.2576

Amount remaining ≈ 2.576 g

Therefore, approximately 2.576 grams of the original 10-gram sample of strontium-90 would be left after 84 years.

Sodium chloride is an ionic compound. The chemical name of Sodium chloride is NaCl.

Ionic compounds are made up of ions. They have charged particles. Ionic compounds when dissolved in solvents they form ions. Sodium chloride losses Na + and cl ions. Magnesium oxide will form mg2+ and O2 ions.

Ionic compounds dissolve in polar solvents. Examples are water, methanol and formamide. For ionic compounds to dissolve there will be ionic compounds will form.

Ionic bonds are not directional. There would be electrostatic or columbic attraction will be form in molecules.  The bonding seen in ionic compounds is called ionic bonding. There are two types of ions seen in molecules such as positive ions and negative ions.

Therefore, Sodium chloride is an ionic compound. The chemical name of Sodium chloride is NaCl.

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Answer: B

Explanation: JUST TOOK THE QUIZ

Atomicity refers to the number of atoms present in a molecule of an element or compound. It indicates whether an element exists as individual atoms or as a group of atoms bonded together in a molecule.

Some elements exist as single atoms, known as monatomic elements. Examples include noble gases like helium (He), neon (Ne), and argon (Ar). These gases have stable electronic configurations and do not readily form bonds with other elements.

Other elements exist as diatomic molecules, meaning they are composed of two atoms bonded together. Examples of diatomic elements include hydrogen (H2), oxygen (O2), and nitrogen (N2). These elements form diatomic molecules due to their strong covalent bonds.

Additionally, some elements can exist as polyatomic molecules, meaning they are composed of three or more atoms bonded together. Examples include ozone (O3) and sulfuric acid (H2SO4). These elements form complex structures due to the sharing of electrons between multiple atoms.

Understanding the atomicity of elements is crucial in various chemical reactions and understanding their properties. It helps determine the stoichiometry of reactions, the formation of compounds, and the behavior of elements under different conditions.

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Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

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Answer:

Heat that flows by conduction is the transfer of thermal energy between substances in contact. What must occur for this to happen? The two systems must be the same temperature. The two systems must not be touching each another.

The coefficient of ammonia in the above chemical equation is 3.

A chemical equation is said to be balanced when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side.

Balancing chemical equations involves the addition of stoichiometric coefficients to the reactants and products.

According to this question, ammonia reacts with oxygen gas to produce nitrogen oxide and water as follows:

4NH₃ + 50₂ → 4NO + 6H₂O

Based on the above balanced equation, it can be said that the coefficient of ammonia is 4.

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1.ONCl is polar covalent compound.

2.H₂O₂ is polar covalent compound.

3.C₂H₄ is non polar covalent compound.

4. O₂ is non polar covalent compound.

5.CH₂S is an ionic compound.

In most cases, ionic compounds are created when a metal interacts with a nonmetal. The reaction between two nonmetals produces covalent compounds. Binary compounds containing hydrogen are typically covalent compounds since hydrogen is a nonmetal.

Because of the largely minor difference in electronegativity, the covalent bond is sometimes referred to as nonpolar. It also implies that there is no charge gap between the two atoms or that their electronegativity is identical.

Two oxygen atoms make up one oxygen molecule. Two covalent connections, one of which is a sigma bond and the other a pi bond, are formed when each O atom shares its two electrons.

Thus,  O₂ is non polar covalent compound.

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The actual volume of water measured out is 10.012 mL.

To determine the actual volume of water, we can use the density formula: density = mass/volume.

Rearranging the formula to solve for volume, we get: volume = mass/density.

Plugging in the given values, we get:

volume = 9.990 g / 0.9978 g/mL = 10.012 mL.

Therefore, the actual volume measured out is slightly greater than the nominal volume of 10 mL, likely due to the meniscus formed by the water at the top of the pipet. This highlights the importance of proper measurement techniques and accounting for sources of error in experimental measurements.

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Answer:

Yes

Explanation:

literally have no idea i just got it right on ck-12 lol

Yes, we determine how much heat "Q" is released under a given set of circumstances if we know the specific heat "c" of the material

The specific heat capacity "c" of a material is the amount of heat required to raise the temperature of a unit substance by 1kg. Mathematically, it is expressed as:

\(c=\frac{m}{Q\triangle \theta}\) where:

m is the mass of the object

Q is the amount of heat absorbed or released by the object

Hence from the formula that we determine how much heat "Q" is released under a given set of circumstances if we know the specific heat "c" of the material

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Here the function name is echo_gen.

Inputs:

input: column vector with values between -1 and 1 representing a time series of digitized sound data

fs: sampling rate in Hz

delay: delay of the echo in seconds

amp: amplification of the echo

Output:

output: column vector containing the original sound with the echo superimposed. The output vector will be longer than the input vector if the delay is not zero (round to the nearest number of points needed to get the delay, as opposed to floor or ceil).

What is an amplification?

Amplification refers to the increase in the amplitude or strength of an electrical signal, often achieved using an amplifier. It is the process of boosting a signal to a higher level, typically to make it more powerful or louder.

What is an echo ?

An echo is a sound reflection that arrives at the listener some time after the direct sound. It is caused by sound waves bouncing off a surface and returning to the listener. The time delay between the direct sound and the reflected sound, as well as the number and intensity of the reflections, can create unique acoustic effects that can be pleasing or undesirable, depending on the context.

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The poor source of iron is soysters. Heme iron is determined in meat, fish and poultry.

Heme iron is determined in meat, fish and poultry. It is the shape of iron this is maximum conveniently absorbed via way of means of your body. You take in as much as 30 percentage of the heme iron which you consume. Eating meat usually boosts your iron ranges a long way greater than consuming non-heme iron. Milk and milk substitutes are bad reassets of iron. Milk interferes with the body's capacity to take in iron from meals and supplements. Excessive cow's milk can motive microscopic harm to the intestines and motive small quantities of blood loss. When blood is misplaced, iron is misplaced with it.

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The direction of V is 39.29° (approx) below the negative x-axis.Hence, the direction of V is 39.29° (approx) below the negative x-axis.

Given that Vx​=7.70 units and

Vy​=−6.00 units.

We need to determine the (a) the magnitude and (b) direction of V.

Step 1:Let's apply Pythagoras theorem to find the magnitude of V.

It is given that, Vx​=7.70 units and Vy​=−6.00 units.

By Pythagoras theorem, we have,

V = √Vx​2 + Vy​2V

= √(7.70)2 + (−6.00)2V

= √(59.29) V = 7.70 units (approx)

Therefore, the magnitude of V is 7.70 units (approx).

Step 2:Let's determine the direction of V.Since Vx​=7.70 units is positive and Vy​=−6.00 units is negative.

Therefore, the vector V lies in the fourth quadrant.In the fourth quadrant, tanθ = Vy​/Vx​tanθ

= (-6.00) / (7.70)tanθ

= - 0.77922θ

= tan-1 (-0.77922)θ

= -39.29°

The direction of V is 39.29° (approx) below the negative x-axis.Hence, the direction of V is 39.29° (approx) below the negative x-axis.

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Answer:

19.3

Explanation:

V=4^3 a^3,  to find volume with sides

p= 1235/64, Mass/ Volume= Density

To calculate the time it takes to recharge the battery, we need to use the concept of Faraday's laws of electrolysis.

Faraday's second law states that the amount of substance deposited or liberated at an electrode during electrolysis is directly proportional to the quantity of electricity passed through it.
First, let's find the number of moles of pb(s) consumed during discharge. We can use the molecular weight of pb to convert grams to moles:

1.00 g Pb x (1 mol Pb / 207.2 g Pb) = 0.004825 mol Pb.
Since 1.36 A of current flows through the battery during charging, we can calculate the number of Coulombs (C) of charge passed through the battery per second using the equation: Q = I * t, where Q is the charge in Coulombs and I is the current in Amperes. Thus, Q = (1.36 A) * (1 s) = 1.36 C.
Now, let's find the number of moles of pbso4(s) formed during discharge. Each mole of pb(s) consumes two moles of electrons to convert to pbso4(s). Therefore, the number of moles of pbso4(s) formed is equal to twice the number of moles of pb(s) consumed: 2 * 0.004825 mol Pb = 0.00965 mol PbSO4.
To calculate the time required for recharging, we divide the quantity of electricity passed (1.36 C) by the number of Coulombs required to produce 1 mol of pbso4(s). This can be calculated using Faraday's constant, F = 96485 C/mol. Thus, t = Q / (F * n), where t is the time in seconds, Q is the charge in Coulombs, F is Faraday's constant, and n is the number of moles of pbso4(s) formed.
t = (1.36 C) / (96485 C/mol * 0.00965 mol)

= 0.1456 s.
Finally, we convert the time to minutes by multiplying by 60 seconds per minute:

t = 0.1456 s * (1 min / 60 s)

= 0.00243 minutes.
Therefore, it will take approximately 0.00243 minutes (or about 0.146 seconds) to recharge the battery.

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To calculate the time it will take to recharge the battery, we need to use the concept of Faraday's law of electrolysis.

First, let's find the number of moles of PbSO4(s) that is formed by the consumption of 1.00 g of Pb(s) at the anode. To do this, we divide the mass of Pb(s) by its molar mass:

1.00 g Pb / 207.2 g/mol = 0.00482 mol Pb

Next, we can use the stoichiometry of the reaction to find the number of moles of electrons transferred during the conversion of PbSO4(s) back to Pb(s). The balanced equation shows that 2 moles of electrons are transferred for every 1 mole of PbSO4(s) formed:

0.00482 mol Pb * 2 mol e-/1 mol PbSO4 = 0.00964 mol e-

Now, we can use Faraday's law to calculate the total charge (Q) required to convert PbSO4(s) back to Pb(s):

Q = n * F

where n is the number of moles of electrons transferred and F is Faraday's constant (96485 C/mol).

Q = 0.00964 mol e- * 96485 C/mol = 932.194 C

Finally, we can calculate the time (t) required to recharge the battery using the equation:

t = Q / I

where I is the current produced by the alternator (1.36 A).

t = 932.194 C / 1.36 A = 685.15 s

To convert seconds to minutes, we divide by 60:

685.15 s / 60 s/min = 11.419 min

Rounded to three decimal places, it will take approximately 11.419 minutes to recharge the battery.

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Mass of Lithium = 1443.73 g ≈ 1.4 kg

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

The number of atoms of Li = N=1.25 x 10²⁶

mol Li(n) :

\(\tt n=\dfrac{N}{No}\\\\n=\dfrac{1.25\times 10^{26}}{6.02\times 10^{23}}\\\\n=2.08\times 10^2\)

mass Li (Ar=6.941 g/mol)

\(\tt mass=mol\times Ar\\\\mass=208\times 6,941\\\\mass=1443.73~g\)

If you dissolve 113.3 g kbr in enough water to make 131.98 ml of solution, the molarity of the solution is 14.79

Molarity is a unit of concentration measuring the number of moles of a solute per liter of solution.

Molarity= Mole of solute/Volume of solution(L)

​Moles of KF= Weight /Molecular weight =113.3/58 =1.953

Molarity= (1.953/131.98) x 1000 =14.79

​Molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution. In chemistry, the most commonly used unit for molarity is the number of moles per liter, having the unit symbol mol/L or mol/dm3 in SI unit. A solution with a concentration of 1 mol/L is said to be 1 molar, commonly designated as 1 M.

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Answer:

5

Explanation:

Protons are depicted in this picture as +, and the no. of protons are always equal to the no. of electrons (unless it's an ion).

Over here, there are 5 protons therefore there should also be 5 electrons.

The chemical formula of mentioned substances is as follows 1) SO₃ 2) K\(^+\) and NO₃\(^-\) 3) ΔH 4) Cu 5) Hg (l) 6)ZnCl₂.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

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Answer:

In units of measurement of length we use centimeter (cm) to measure. We can use this unit for measuring the length of a pencil, the width of a book etc. but this unit is too big to measure the thicken of a pencil. So we use another unit called millimeter (mm).

Explanation:

1. Can water stay liquid below zero degrees Celsius?

Yes, under certain conditions, water can remain liquid below zero degrees Celsius. This phenomenon is known as supercooling. Supercooling occurs when water is in a pure state and does not have any impurities or nucleation sites that can trigger the freezing process. When the water is supercooled, it remains a liquid despite being below its freezing point. However, any disturbance or introduction of an impurity can cause the supercooled water to rapidly freeze.

2. How bad of an alcoholic do you have to be to have your brain affected?

The effects of alcohol on the brain can vary depending on several factors, including the amount and frequency of alcohol consumption, individual tolerance, overall health, and genetic predisposition. Prolonged and excessive alcohol consumption can lead to various brain-related issues, such as:

- Cognitive impairment: Long-term heavy drinking can impair cognitive functions, including memory, attention, and problem-solving abilities.

- Wernicke-Korsakoff syndrome: This is a severe neurological disorder caused by a deficiency of thiamine (vitamin B1) often associated with alcohol abuse. It can lead to memory problems, confusion, coordination difficulties, and even permanent brain damage.

- Structural brain changes: Chronic alcohol abuse can lead to shrinkage of brain tissue, particularly in areas associated with memory and cognitive functions.

- Increased risk of mental health disorders: Alcohol abuse is associated with an increased risk of developing mental health conditions such as depression, anxiety disorders, and alcohol-induced psychosis.

It's important to note that the impact of alcohol on the brain can vary from person to person, and some individuals may be more susceptible to the negative effects of alcohol than others. It is always advisable to consume alcohol in moderation or, in some cases, avoid it altogether to maintain good brain health.

3. How does dissolving a salt molecule in water make its atoms ionize?

When a salt molecule, such as sodium chloride (NaCl), dissolves in water, its atoms or ions separate and become surrounded by water molecules. This process is known as ionization or dissociation. In the case of NaCl, the salt molecule consists of one sodium ion (Na+) and one chloride ion (Cl-).

When the salt is added to water, the positive hydrogen (H) end of the water molecule attracts the negatively charged chloride ion (Cl-), and the negative oxygen (O) end of the water molecule attracts the positively charged sodium ion (Na+). This attraction between the water molecules and the ions causes the salt molecule to break apart or ionize.

The resulting ions, Na+ and Cl-, become surrounded by water molecules, with the water's positive ends surrounding the chloride ions and the water's negative ends surrounding the sodium ions. This process is known as hydration or solvation, and it helps to stabilize the ions in the water solution.

So, in summary, dissolving a salt molecule in water allows its atoms to ionize as the water molecules surround and stabilize the separated positive and negative ions.

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Explanation:

1.

If you apply enough pressure (making it hard for the water molecules to spread out into the solid structure), you can have liquid water several degrees below zero degrees Celsius.

2.

Alcohol interferes with the brain's communication pathways and can affect the way the brain looks and works. Alcohol makes it harder for the brain areas controlling balance, memory, speech, and judgment to do their jobs, resulting in a higher likelihood of injuries and other negative outcomes.

3.

Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules. Once this happens, the salt is dissolved, resulting in a homogeneous solution.

a) The selectivity of a reaction is defined as the ratio of the rate of formation of the desired product to the sum of the rates of formation of all products. In this case, we have two parallel reactions: A ⟶ D and A ⟶ U. The selectivity (S) can be calculated as:

S = (rate of formation of D) / (rate of formation of D + rate of formation of U)

b) Manipulating the concentration of species A (CA) can affect the selectivity by altering the reaction rates of the individual pathways. By increasing or decreasing the concentration of A, we can favor one reaction pathway over the other, thereby increasing selectivity.

To justify this, let's consider the rate equations for the two reactions:

Rate of formation of D = k0 * CA

Rate of formation of U = k11 * CA

From the rate equations, it is clear that the rates of formation for both D and U are directly proportional to the concentration of A (CA). By increasing CA, both reaction rates will increase. However, the relative increase in the rate of the desired product (D) will be larger compared to the increase in the rate of the undesired product (U) if the rate constants (k0 and k11) are significantly different.

Thus, by manipulating the concentration of A, we can adjust the ratio of the reaction rates and bias the system towards the desired product, thereby increasing selectivity.

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Answer:

Yes, it is a fact that saturated fats contain more gross energy due to higher H+ concentration. However, unsaturated fats are more digestible and have higher absorption rate, and therefore the metabolizable energy that unsaturated fats provide is higher than that provided by saturated fats.

Explanation:

The given number is can be written in standard form as 1 times 10 to power negative 10 ( 1 x 10⁻¹⁰).

A standard form is a form of writing a given mathematical concept like an equation, number, or an expression in a form that follows certain rules.

The given number =  1.0 x 10^-10

The given figures can be written in standard form as follows;

1.0 x 10^-10 = 1 x 10⁻¹⁰

Thus, the given number is can be written in standard form as 1 times 10 to power negative 10 ( 1 x 10⁻¹⁰).

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Answer:

It may leave some chemicals such as herbicides and pesticides in the water

Explanation:

i just took the test

Distillation may leave some chemicals such as herbicides and pesticides in the water. Therefore, option D is correct.

By using selective boiling and condensation, distillation, also known as traditional distillation, is the process of removing the constituents or compounds from a liquid mixture. The process of heating solid materials to create gaseous products is known as dry distillation.

A chemical is purified through distillation by being separated from a non-volatile or less-volatile substance. Because various compounds frequently have different boiling points, when a mixture is distilled, the components frequently separate from the mixture.

Among the many industrial uses of distillation are the production of alcoholic drinks, water purification, and oil refining. Distillation is a physical procedure that removes desired pure compounds from an initial source using heat and other techniques.

Thus, option D is correct.

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Answer: Thus X is Plutonium

Explanation:

Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.

General representation of alpha decay :

\(_{Z}^{A}\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\textrm{He}\)

where Z = atomic number

A= mass number

X and Y = atomic symbol of elements

\(_{Z}^{A}\textrm{X}\rightarrow _{92}^{235}\textrm{U}+_2^4\textrm{He}\)

Thus \(_{94}^{239}\textrm{Pu}\rightarrow _{92}^{235}\textrm{U}+_2^4\textrm{He}\)

Thus X is Plutonium with atomic number 94 and mass number 239

Answer:

the answer is D on edge

Explanation: