Bonding Unit Test Review

The chemical bond formed when two atoms share electrons is called a(n)

• covalent bond

• ionic bond

• metallic bond

• electron bond

Which pair of atoms will combine with each other and form an ionic bond ?

• C and O

• C and H

• Ca and Mg

• Ca and Br

Which element is most likely to gain electrons in a chemical reaction?

• Kr

• K

• Br

• Ca

Atoms become positive ions by

• gaining electrons.

• losing electrons.

• gaining protons.

• losing protons.

Which formula represents a substance that contains covalent bonds?

• LiCl

• CaCl₂

• K₂O

• CO₂

Anions are formed by

• gaining electrons.

• losing electrons.

• gaining protons.

• losing protons.

How does an atom of aluminum become an ion?

• It gains 3 electrons.

• It loses 3 electrons.

• It gains 3 protons.

• It loses 3 protons.

Which element will most likely form an ionic bond with chlorine?

• O

• N

• S

• K

Ho many electrons are shared between the hydrogen atoms in a molecule of H_{2 gas?}

• 0

• 1

• 2

Which of the atoms are most likely to form covalent bonds?

• metal atoms that share electrons

• metal atoms that share protons

• nonmetal atoms that share electrons

• nonmetal atoms that share protons