Question 1

Which statement best explains why noble gases rarely form chemical bonds with other atoms?

Accepted Answer

Their outermost energy level is completely filled, making them stable.

Question 2

When sodium (Na) reacts with chlorine (Cl) to form sodium chloride (NaCl), what type of bond is formed?

Accepted Answer

Ionic bond

Question 3

An atom with 7 electrons in its outermost shell is in which group of the periodic table?

Accepted Answer

Group 17 (halogens)

Question 4

Which of the following best describes a covalent bond?

Accepted Answer

A sharing of electron pairs between atoms

Question 5

Atoms that are joined together by covalent bonds are called:

Accepted Answer

Molecules

Question 6

Which of the following elements produces an exception to the octet rule for each atom filled with electrons?

Accepted Answer

Hydrogen

Question 7

A sodium atom (Na) bonds with a chlorine atom (Cl) to form an ionic compound. The formula for this compound is:

Accepted Answer

$\mathrm{NaCl}$

Question 8

How many electrons, sodium (Na), sulfur (S), and oxygen (O) will each contribute to the formation of $\mathrm{Na_2SO_4}$?

Accepted Answer

Na: 1, S: 6, O: 6 (each O atom shares 2 electrons)

Question 9

The Mg atom becomes the ion $\mathrm{Mg^{2+}}$ when it:

Accepted Answer

Loses 2 electrons

Question 10

In the atomic representation below, the small dark circles represent electrons. How many valence electrons does the atom shown have?

Accepted Answer

6

Question 11

Density of elements in a period (row) is similar because the largest number of valence electrons have:

Accepted Answer

The same total energy level

Question 12

Which diagram best represents the Lewis dot diagram of a chlorine atom?

Accepted Answer

A diagram with 7 dots around the symbol Cl

Question 13

Elements in the first column of the periodic table are known as alkali metals. These elements, when ionized, have:

Accepted Answer

An oxidation number of $+1$

Question 14

Which statement is TRUE about elements in group 18?

Accepted Answer

They have a complete outer shell.

Question 15

Which of the following compounds is NOT organic?

Accepted Answer

Salt (NaCl)

Question 16

Which of the following is made up of amino acids?

Accepted Answer

Collagen

Question 17

A diagram shows an enzyme and three different molecules. Which of the three molecules would the enzyme target for a reaction?

Accepted Answer

B

Question 18

Which of the following best describes the function of lipids in plants and animals?

Accepted Answer

They provide energy storage and insulation.

Question 19

Which of the following is a property of ionic solids?

Accepted Answer

They have high melting points.

Question 20

When two hydrogen atoms (atomic number 1) and one oxygen atom (atomic number 8) bond, the covalent molecule formed is:

Accepted Answer

$\mathrm{H_2O}$

Study Guide: Atoms, Elements, and Chemical Bonding

Study Guide - Practice Questions