Question 1

Which of the following best explains why the atomic radius increases as you move down a group in the periodic table?

Accepted Answer

The number of energy levels increases, placing valence electrons farther from the nucleus.

Question 2

Which element would you expect to have the highest first ionization energy?

Accepted Answer

Ne

Question 3

What is the electron configuration for the Fe$$^{3+}$$ ion?

Accepted Answer

$$1s^22s^22$p^63s^23$p^63d^5$

Question 4

Which of the following statements about the Pauli Exclusion Principle is correct?

Accepted Answer

No two electrons in an atom can have the same set of four quantum numbers.

Question 5

Which of the following ions is isoelectronic with Ne?

Accepted Answer

Na$$^+$$

Question 6

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

Accepted Answer

Metallic character decreases from left to right.

Question 7

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

Accepted Answer

Cl

Question 8

Why do alkali metals react vigorously with water?

Accepted Answer

They easily lose their single valence electron, forming a cation and releasing energy.

Question 9

Which of the following is the correct order of sublevel energies in a multielectron atom (from lowest to highest)?

Accepted Answer

$$1s \u003c 2s \u003c 2p \u003c 3s \u003c 3p \u003c 4s \u003c 3d \u003c 4p$$

Question 10

Which of the following best explains why the first ionization energy decreases as you move down a group?

Accepted Answer

The valence electrons are farther from the nucleus and experience more shielding.

Question 11

Which of the following elements has an irregular electron configuration due to sublevel splitting?

Accepted Answer

Cr

Question 12

What is the maximum number of electrons that can occupy the 3d sublevel?

Accepted Answer

10

Question 13

Which of the following best describes the trend in atomic radius across a period?

Accepted Answer

Atomic radius decreases from left to right.

Question 14

Which of the following is a property of nonmetals?

Accepted Answer

Brittle in solid state

Question 15

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

Accepted Answer

They have high electron affinities and readily gain electrons.

Question 16

Which of the following ions is larger: S$$^{2-} or Cl$^-$$? Explain why.

Accepted Answer

S$$^{2-}$$, because it has more electrons and a lower effective nuclear charge.

Question 17

Which quantum number describes the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number, $$m_l$$

Question 18

Which of the following best describes the electron configuration of a halogen in its ground state?

Accepted Answer

ns$$^2np$^5$$

Question 19

Which of the following best explains why the noble gases are so unreactive?

Accepted Answer

They have a stable, full valence shell electron configuration.

Question 20

Which of the following is the correct formula for Coulomb’s Law describing the energy between two charged particles?

Accepted Answer

$$E = \frac{1}{4\pi\$$varepsilon_0$$} \frac{q_1$ q_2$}{r}$$

Periodic Properties of the Elements: Structure, Trends, and Applications

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