Question 1

Which of the following elements has the smallest atomic radius?

$$	ext{A) Na} \qquad 	ext{B) Cl} \qquad 	ext{C) Mg} \qquad 	ext{D) Si}$$

Accepted Answer

Cl

Question 2

Which of the following ions is isoelectronic with Ne?

$$	ext{A) F}^- \qquad 	ext{B) Na}^+ \qquad 	ext{C) Mg}^{2+} \qquad 	ext{D) All of the above}$$

Accepted Answer

All of the above

Question 3

Which of the following statements best explains why the first ionization energy decreases as you move down Group 1A?

$$	ext{A) The effective nuclear charge increases.}$$
$$	ext{B) The electrons are closer to the nucleus.}$$
$$	ext{C) The outermost electrons are in higher principal energy levels, farther from the nucleus.}$$
$$	ext{D) The number of protons decreases.}$$

Accepted Answer

The outermost electrons are in higher principal energy levels, farther from the nucleus.

Question 4

Which element would you expect to have the most negative electron affinity?

$$	ext{A) Na} \qquad 	ext{B) Cl} \qquad 	ext{C) Ar} \qquad 	ext{D) Mg}$$

Accepted Answer

Cl

Question 5

Which of the following ions is paramagnetic?

$$	ext{A) Ca}^{2+} \qquad 	ext{B) N}^{3-} \qquad 	ext{C) Fe}^{3+} \qquad 	ext{D) Zn}^{2+}$$

Accepted Answer

Fe$$^{3+}$$

Question 6

Arrange the following elements in order of decreasing first ionization energy: S, Ca, F, Rb, Si.

Accepted Answer

F \u003e S \u003e Si \u003e Ca \u003e Rb

Question 7

Which of the following best describes the trend in atomic radius across a period from left to right?

$$	ext{A) Increases due to more protons}$$
$$	ext{B) Decreases due to increasing effective nuclear charge}$$
$$	ext{C) Remains constant}$$
$$	ext{D) Increases due to more electrons}$$

Accepted Answer

Decreases due to increasing effective nuclear charge

Question 8

Which of the following reactions is most exothermic?

$$	ext{A) 2Na (s) + Cl_2$ (g) ightarrow 2NaCl (s)}$$
$$	ext{B) 2Na (s) + H_2O (l) ightarrow 2NaOH (aq) + H_2$ (g)}$$
$$	ext{C) H_2$ (g) + Cl_2$ (g) ightarrow 2HCl (g)}$$
$$	ext{D) Br_2$ (l) + F_2$ (g) ightarrow 2BrF (g)}$$

Accepted Answer

2Na (s) + Cl$$_2 (g$$) $$\rightarrow 2$$NaCl (s)

Question 9

Which of the following elements is most metallic?

$$	ext{A) Na} \qquad 	ext{B) Al} \qquad 	ext{C) Si} \qquad 	ext{D) P}$$

Accepted Answer

Na

Question 10

Which of the following best explains why cations are smaller than their parent atoms?

$$	ext{A) Cations have more protons than electrons}$$
$$	ext{B) Cations have fewer electrons, so the remaining electrons are pulled closer to the nucleus}$$
$$	ext{C) Cations have more electrons, increasing electron-electron repulsion}$$
$$	ext{D) Cations have a higher principal quantum number}$$

Accepted Answer

Cations have fewer electrons, so the remaining electrons are pulled closer to the nucleus

Question 11

Which of the following electron configurations represents a transition metal cation?

$$	ext{A) [Ar] 4s^2$ 3d^3$}$$
$$	ext{B) [Ar] 4s^0$ 3d^3$}$$
$$	ext{C) [Ne] 3s^2$ 3p^6$}$$
$$	ext{D) [Kr] 5s^2$ 4d$$^{10}$$}$$

Accepted Answer

[Ar] 4s$$^0 3d$^3$$

Question 12

Which of the following elements would have the highest second ionization energy?

$$	ext{A) Na} \qquad 	ext{B) Mg} \qquad 	ext{C) Al} \qquad 	ext{D) Si}$$

Accepted Answer

Na

Question 13

Which of the following best describes the electron configuration of $$	ext{Co}^{2+}$$?

$$	ext{A) [Ar] 4s^2$ 3d^5$}$$
$$	ext{B) [Ar] 4s^0$ 3d^7$}$$
$$	ext{C) [Ar] 4s^2$ 3d^7$}$$
$$	ext{D) [Ar] 4s^1$ 3d^6$}$$

Accepted Answer

[Ar] 4s$$^0 3d$^7$$

Question 14

Which of the following elements is most likely to form a $$2+$$ ion?

$$	ext{A) Na} \qquad 	ext{B) Mg} \qquad 	ext{C) Al} \qquad 	ext{D) Cl}$$

Accepted Answer

Mg

Question 15

Which of the following best explains why halogens are excellent oxidizing agents?

$$	ext{A) They have low ionization energies}$$
$$	ext{B) They have high electron affinities}$$
$$	ext{C) They have full valence shells}$$
$$	ext{D) They are metals}$$

Accepted Answer

They have high electron affinities

Question 16

Which of the following elements would you expect to be most reactive with water?

$$	ext{A) Li} \qquad 	ext{B) Na} \qquad 	ext{C) K} \qquad 	ext{D) Cs}$$

Accepted Answer

Cs

Question 17

Which of the following best describes the trend in metallic character across a period?

$$	ext{A) Increases}$$
$$	ext{B) Decreases}$$
$$	ext{C) Remains constant}$$
$$	ext{D) Increases then decreases}$$

Accepted Answer

Decreases

Chapter 9: Periodic Properties of the Elements – Study Notes

스터디 가이드 - 연습 문제

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