Question 1

Which of the following best describes electron affinity (EA)?

Accepted Answer

The energy released when an electron is added to a gaseous atom or ion.

Question 2

Given the reaction $$\mathrm{C\ (g) + e^- \rightarrow C^-\ (g) + Energy}$$, what does the energy term represent?

Accepted Answer

Electron affinity

Question 3

Which element in the following set has the largest electron affinity: N, O, C, B, Ne?

Accepted Answer

Oxygen

Question 4

Which of the following halogens will release the most energy when an electron is added?

Accepted Answer

Chlorine

Question 5

Arrange the following elements in order of increasing electron affinity: Cs, Hg, F, S.

Accepted Answer

Cs, Hg, S, F

Question 6

Which atom has the least tendency to gain another electron?

Accepted Answer

Neon

Question 7

What is the general periodic trend for electron affinity as you move from left to right across a period?

Accepted Answer

Electron affinity increases

Question 8

Why do noble gases like neon have very low electron affinity?

Accepted Answer

They have stable electron configurations and do not easily accept electrons.

Question 9

Which of the following elements is most likely to accept an electron: F, Li, C, O, Be?

Accepted Answer

Fluorine

Question 10

A patient is exposed to mercury vapor. Based on electron affinity trends, which element in the set Cs, Hg, F, S is least likely to form a stable negative ion in the body?

Accepted Answer

Mercury

Question 11

Which of the following statements about electron affinity is correct?

Accepted Answer

Electron affinity is the energy released when an atom gains an electron.

Question 12

Which element would you expect to have the lowest electron affinity: Na, Cl, Ne, S?

Accepted Answer

Neon

Question 13

If an atom has a stable electron configuration, what can you infer about its electron affinity?

Accepted Answer

It will have a low electron affinity.

Question 14

Which of the following elements is most likely to form a negative ion in a chemical reaction: Be, O, Ne, Li?

Accepted Answer

Oxygen

Question 15

A scientist is studying the electron affinity of elements in Group 1A. Which statement is most accurate?

Accepted Answer

Group 1A elements have low electron affinity.

Question 16

Which element would release the most energy upon gaining an electron: S, F, Cs, Hg?

Accepted Answer

Fluorine

Question 17

Which of the following best explains why oxygen has a higher electron affinity than nitrogen?

Accepted Answer

Oxygen has a higher nuclear charge and is closer to completing its octet.

Question 18

Which element in the following set is least likely to accept an electron: F, Li, C, O, Be?

Accepted Answer

Beryllium

Question 19

If an element has a very low electron affinity, what does this suggest about its chemical reactivity?

Accepted Answer

It is unlikely to form negative ions.

Question 20

Which of the following elements would you expect to have the highest electron affinity: S, F, Ne, Cs?

Accepted Answer

Fluorine

Electron Affinity: Concepts, Trends, and Practice Problems

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