2nd Semester Physical Science 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

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

A regular, repeating arrangement of atoms, ions, and molecules is __________.

• A compound
• A crystal
• Impossible to break
• A polyatomic ion

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