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charle [14.2K]
3 years ago
13

elect the best choice, and briefly indicate the reason for your choice: a. Lowest ionization energy: K Rb Cs b. Most favorable e

lectron affinity: Cl Br I c. Most energy required to remove an electron: Cu Cu Cu2
Chemistry
1 answer:
artcher [175]3 years ago
3 0

Answer:

Lowest ionization energy: Cs

Most favorable electron affinity: Cl

Most energy required to remove an electron: Cu2+

Explanation:

Ionization energy decreases down the group. That means that as we move down the group, the ionization energy of elements decreases due to greater distance of the outermost electron from the nucleus and greater screening effect of inner electrons on this outermost electron. Hence Cs has the lowest ionization energy.

Electron affinity of halogens decreases down the group. Hence, Cl possess the most favorable electron affinity.

When an electron has been removed from an atom, the removal of the next electron is usually harder. Thus, the second ionization energy is always greater than the first ionization energy and so on. Thus, it is most difficult to remove an electron from Cu^2+ from which two electrons have already been removed.

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Select the properly written and balanced equation for the following chemical reaction: Sodium metal and an aqueous solution of m
Setler [38]

Answer:2Na(s)+MgI_2 (aq)\rightarrow 2NaI(aq)+Mg(s)

Explanation: The chemical reaction is written by writing down the chemical formulas of the reactants on the left hand side and the chemical formulas of products on the right hand side separated by a right arrow.

This is a single displacement reaction in which a more reactive element displaces the less reactive element from its salt solution. Thus sodium is more reactive than Mg and thus displaces it from MgI_2.

2Na(s)+MgI_2 (aq)\rightarrow 2NaI(aq)+Mg(s)

The number of atoms of each element must be same on both sides of the reaction so as to follow the law of conservation of mass. Thus the equation is balanced.

5 0
3 years ago
Pure magnesium metal is often found as ribbons and can easily burn in the presence of oxygen. when 2.59 g of magnesium ribbon bu
stepan [7]
Burning Mg in the air and reacting with O2 forming a white powder of MnO

So the equation is going to be:
Mn + O2 ⇒ MnO (this equation is not conserved)

to make it equilibrium:
1- First we should put 2Mno to equal the O2 on both sides.
So it will be:
Mg + O2⇒ 2MgO
2- Second we should put 2Mn to equal the Mn on both sides.
2Mg + O2⇒ 2MgO (this equation is conserved)
After putting the physical states the final equilibrium equation is going to be:
                        Δ
2Mg(s) + O2(g)⇒ 2MgO(s)

 

4 0
3 years ago
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guapka [62]

99% sure its false

its arranged by atomic number now i believe

5 0
3 years ago
I need help with this question ASAP
avanturin [10]

Answer:

True

Explanation:

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7 0
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serg [7]

Answer:

acid precipitation is an agent of

Explanation:

4 0
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