Unit 8 - Bonding 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. C and O

• B. C and H

• C. Ca and Mg

• D. Ca and Br

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

• Kr

• K

• Br

• Ca

What is the oxidation number of oxygen in most compounds?

• 6

• -2

• 8

• 0

Which formula represents a substance that contains covalent bonds?

• LiCl

• CaCl₂

• K₂O

• CO₂

How does an atom of aluminum become an ion?

• It gains 3 electrons

• It gains 3 protons

• It loses 3 electrons

• It loses 3 neutrons

How many electrons are shared within a single bond?

• 0

• 1

• 2

• 4

Which 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

The electrons that are lost, gained, or shared in chemical bonds are called __________.

• valence electrons

• chemical electrons

• Lewis electrons

• none of the above

Which of the following is NOT an example of covalent bonding?

• H₂O

• NaF

• NH₃

• O₂