Question 1

Which of the following best explains why the ionic radius of a cation is smaller than its neutral atom?

Accepted Answer

Cations lose electrons, resulting in decreased electron-electron repulsion and a smaller radius.

Question 2

Which of the following ions has the largest ionic radius?

Accepted Answer

$$\mathrm{Br^-}$$

Question 3

What happens to the ionic radius when an atom gains electrons to form an anion?

Accepted Answer

The ionic radius increases due to increased electron-electron repulsion.

Question 4

Which statement is correct regarding the periodic trend of ionic radius?

Accepted Answer

Ionic radius increases as the number of electrons increases.

Question 5

Given the following ions: $$\mathrm{Li^+}$$, $$\mathrm{Na^+}$$, $$\mathrm{K^+}$$, which has the largest ionic radius?

Accepted Answer

$$\mathrm{K^+}$$

Question 6

A patient is found to have high levels of $$\mathrm{S$$^{2-}$$}$$ ions in their blood. Compared to a neutral sulfur atom, how does the ionic radius of $$\mathrm{S$$^{2-}$$}$$ differ?

Accepted Answer

The ionic radius of $$\mathrm{S$$^{2-}$$} is $$larger than that of a neutral sulfur atom.

Question 7

Which of the following correctly ranks the ionic radii from smallest to largest: $$\mathrm{Ca}$$, $$\mathrm{Ca$$^{2+}$$}$$, $$\mathrm{Ca$$^{2-}$$}$$?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$} \u003c \mathrm{Ca} \u003c \mathrm{Ca$$^{2-}$$}$$

Question 8

A chemist compares the ionic radii of $$\mathrm{P$$^{3-}$$}$$ and $$\mathrm{P}$$ atoms. What is the expected result?

Accepted Answer

$$\mathrm{P$$^{3-}$$}$$ has a larger ionic radius than $$\mathrm{P}.$$

Question 9

Which of the following statements is FALSE regarding ionic radii?

Accepted Answer

Ionic radius decreases when electrons are gained.

Question 10

If a sodium atom ($$\mathrm{Na}) $$loses one electron to become $$\mathrm{Na^+}$$, what happens to its ionic radius?

Accepted Answer

The ionic radius decreases.

Question 11

Which of the following ions would you expect to have the smallest ionic radius?

Accepted Answer

$$\mathrm{Al$$^{3+}$$}$$

Question 12

A medical laboratory analyzes the ionic radii of $$\mathrm{Cl^-}$$ and $$\mathrm{Cl} in a $$blood sample. Which statement is correct?

Accepted Answer

$$\mathrm{Cl^-}$$ has a larger ionic radius than $$\mathrm{Cl}.$$

Question 13

Which of the following best describes the trend in ionic radius across a period for cations?

Accepted Answer

Ionic radius decreases as the charge on the cation increases.

Question 14

Which of the following ions would have the largest ionic radius: $$\mathrm{O$$^{2-}$$}$$, $$\mathrm{F^-}$$, $$\mathrm{Na^+}$$, $$\mathrm{Mg$$^{2+}$$}$$?

Accepted Answer

$$\mathrm{O$$^{2-}$$}$$

Question 15

A student claims that the ionic radius of $$\mathrm{S$$^{2-}$$} is $$smaller than $$\mathrm{S}. Is $$this statement correct?

Accepted Answer

No, $$\mathrm{S$$^{2-}$$}$$ has a larger ionic radius than $$\mathrm{S}.$$

Question 16

Which of the following best explains why anions are larger than their parent atoms?

Accepted Answer

Anions gain electrons, increasing electron-electron repulsion and expanding the electron cloud.

Question 17

Which of the following ions would you expect to have the smallest ionic radius: $$\mathrm{N$$^{3-}$$}$$, $$\mathrm{O$$^{2-}$$}$$, $$\mathrm{F^-}$$, $$\mathrm{Na^+}$$?

Accepted Answer

$$\mathrm{Na^+}$$

Question 18

A patient is given a medication that increases the concentration of $$\mathrm{K^+}$$ ions in their cells. Compared to $$\mathrm{Na^+}$$, how does the ionic radius of $$\mathrm{K^+}$$ compare?

Accepted Answer

$$\mathrm{K^+}$$ has a larger ionic radius than $$\mathrm{Na^+}.$$

Question 19

Which of the following statements is TRUE regarding the relationship between ionic radius and electron configuration?

Accepted Answer

Ionic radius increases when electrons are added to the outer shell.

Ionic Radius: Trends, Definitions, and Practice Questions

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