Question 1

Which of the following statements about elements is correct?

Accepted Answer

Elements are pure substances from which all other things are built.

Question 2

Which group on the periodic table contains the most chemically inert elements?

Accepted Answer

Group 8A (noble gases)

Question 3

A sample of gallium contains 60.10% $$^{69}\mathrm{Ga} (68.926 $$amu) and 39.90% $$^{71}\mathrm{Ga} (70.925 $$amu). What is the average atomic mass of gallium?

Accepted Answer

$$69.93\ \mathrm{amu}$$

Question 4

Which of the following best describes a metalloid?

Accepted Answer

It exhibits properties of both metals and nonmetals.

Question 5

Which of the following statements about atomic structure is FALSE?

Accepted Answer

A neutron has a negative charge.

Question 6

A neutral atom of magnesium has an atomic number of 12 and a mass number of 24. How many protons, neutrons, and electrons does it have?

Accepted Answer

12 protons, 12 neutrons, 12 electrons

Question 7

Which of the following elements is a halogen?

Accepted Answer

Chlorine (Cl)

Question 8

Which of the following best explains why metals are good conductors of electricity?

Accepted Answer

They have loosely held valence electrons that can move freely.

Question 9

Which of the following is the correct electron configuration for a neutral atom of nitrogen (atomic number 7)?

Accepted Answer

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

Question 10

Which element has the largest atomic radius among the following?

Accepted Answer

Cesium (Cs)

Question 11

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have different mass numbers.

Question 12

Which of the following elements is most likely to have electrons in the $$3p$$ sublevel?

Accepted Answer

Chlorine (Cl)

Question 13

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

Accepted Answer

Ionization energy increases.

Question 14

A neutral atom of lead (Pb) has a mass number of 207 and an atomic number of 82. How many neutrons does it have?

Accepted Answer

125

Question 15

Which of the following statements about electromagnetic radiation is correct?

Accepted Answer

High-energy radiation has short wavelengths.

Question 16

Which of the following is a property of nonmetals?

Accepted Answer

Dull, brittle, and poor conductor

Question 17

Which of the following best describes the Pauli exclusion principle?

Accepted Answer

Each orbital can hold a maximum of two electrons with opposite spins.

Question 18

Which of the following elements has the highest ionization energy?

Accepted Answer

Neon (Ne)

Question 19

Which of the following statements about the periodic table is correct?

Accepted Answer

Groups contain elements with similar properties.

Question 20

Which of the following is the correct relationship for a neutral atom?

Accepted Answer

Number of protons = number of electrons

Chapter 4 - Atoms and Elements: Structure, Properties, and the Periodic Table

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