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.

Question 2

What is the general trend for electron affinity across a period from left to right in the periodic table?

Accepted Answer

Electron affinity increases.

Question 3

Which element among the following has the largest electron affinity: O, C, B, Ne?

Accepted Answer

Oxygen ($$O)$$

Question 4

Why do noble gases like Neon ($$Ne) $$have very low electron affinity?

Accepted Answer

They have a full valence shell, making them stable and unlikely to accept additional electrons.

Question 5

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

Accepted Answer

$$Hg \u003c F \u003c S \u003c Ca$$

Question 6

Which of the following atoms has the least tendency to gain another electron?

Accepted Answer

Neon ($$Ne)$$

Question 7

Which halogen will release the most energy with the addition of an electron?

Accepted Answer

Fluorine ($$F)$$

Question 8

What is the main reason why electron affinity generally increases across a period?

Accepted Answer

Increasing nuclear charge attracts added electrons more strongly.

Question 9

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

Accepted Answer

Fluorine ($$F)$$

Question 10

A scientist is studying the electron affinity of elements in Group 1A and Group 7A. Which group is expected to have higher electron affinity values and why?

Accepted Answer

Group 7A, because they are one electron away from a full valence shell.

Question 11

Which of the following best explains why fluorine ($$F) $$has a higher electron affinity than chlorine ($$Cl$$)?

Accepted Answer

Fluorine has a smaller atomic radius, so the added electron is closer to the nucleus.

Question 12

Which of the following elements would you expect to have the lowest electron affinity?

Accepted Answer

Neon ($$Ne)$$

Question 13

If an atom releases $$200 	ext{ kJ/mol} of $$energy when it gains an electron, what does this indicate about its electron affinity?

Accepted Answer

It has a high electron affinity.

Question 14

Which of the following statements about electron affinity is FALSE?

Accepted Answer

Noble gases have very high electron affinity.

Question 15

A patient is exposed to a chemical that readily accepts electrons. Which property of the chemical is most relevant to this behavior?

Accepted Answer

High electron affinity

Question 16

Which of the following elements would be LEAST likely to form a negative ion?

Accepted Answer

Neon ($$Ne)$$

Question 17

Which of the following elements has the highest tendency to accept an electron?

Accepted Answer

Fluorine ($$F)$$

Question 18

Which of the following best describes the periodic trend for electron affinity down a group?

Accepted Answer

Electron affinity decreases.

Question 19

Which element would you expect to have the greatest release of energy upon gaining an electron: $$Na$$, $$Cl$$, $$Ne$$, $$Mg$$?

Accepted Answer

Chlorine ($$Cl)$$

Question 20

A chemist is comparing the electron affinity of $$Be$$ and $$B. $$Which element is expected to have a higher electron affinity and why?

Accepted Answer

Boron ($$B$$), because it is further to the right in the period.

Periodic Trend: Electron Affinity (Simplified)

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