Question 1

Which of the following statements best explains why elements in the same group of the periodic table have similar chemical properties?

Accepted Answer

They have similar valence electron configurations.

Question 2

Which of the following is the correct ground-state electron configuration for the element phosphorus ($$Z = 15) $$using spdf notation?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^3$$

Question 3

Which of the following elements is a transition metal?

Accepted Answer

Iron ($$Fe)$$

Question 4

What is the correct noble gas shorthand electron configuration for silver ($$Ag$$, $$Z = 47$$)?

Accepted Answer

$$[Kr]\ 5s^1$\ 4d$$^{10}$$

Question 5

Which of the following best describes the trend in atomic radius as you move from left to right across a period in the periodic table?

Accepted Answer

Atomic radius decreases due to increasing effective nuclear charge.

Question 6

Which of the following ions is isoelectronic with neon ($$Ne$$)?

Accepted Answer

$$F^-$$

Question 7

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 8

Which of the following elements is expected to be diamagnetic in its ground state?

Accepted Answer

Magnesium ($$Mg)$$

Question 9

What is the expected charge on an ion formed by a sulfur atom?

Accepted Answer

$$-2$$

Question 10

Which of the following best explains why ionization energy generally increases across a period?

Accepted Answer

The effective nuclear charge increases, holding electrons more tightly.

Question 11

Which of the following is the correct electron configuration for the $$Fe^{2+}$$ ion?

Accepted Answer

$$[Ar]\ 3d^6$

Question 12

Which block of the periodic table contains the lanthanide series?

Accepted Answer

f-block

Question 13

Which of the following elements has the highest metallic character?

Accepted Answer

Sodium ($$Na)$$

Question 14

A neutral atom of which element has the following electron configuration: $$[Ne]\ 3s^2$\ 3p^4$?

Accepted Answer

Sulfur ($$S)$$

Question 15

Which of the following best describes Hund’s Rule?

Accepted Answer

Electrons occupy degenerate orbitals singly before pairing.

Question 16

Which of the following elements would have the largest atomic radius?

Accepted Answer

Potassium ($$K)$$

Question 17

Which of the following ions has the smallest ionic radius?

Accepted Answer

$$Mg^{2+}$$

Question 18

Which of the following statements about electron affinity is correct?

Accepted Answer

Electron affinity generally increases (becomes more negative) across a period.

Question 19

Which of the following elements is most likely to form a $$+1$$ ion?

Accepted Answer

Potassium ($$K)$$

Question 20

Which of the following best describes a paramagnetic atom?

Accepted Answer

An atom with one or more unpaired electrons.

Chapter 3: Periodic Properties of the Elements – Study Guide

Study Guide - Practice Questions