Chapter 12 Review

Name that Ion
Li+

• copper (III)
• lithium
• ladmium
• iodine

When an atom loses a valence electron, it becomes a(n) _____________ ion.

• positive
• negative
• neutral
• polyatomic

Which is most likely to form a negative ion?

• an element from group 17
• a metal
• an element from group 1
• an element with atoms that have eight valence electrons

Positive ions form when atoms _________ valence electrons.

• lose
• gain
• share
• gain or share

Negative ions form when atoms _________ valence electrons.

• lose
• gain
• share

Group 17 always has ions with a charge of 

• +1
• +2
• -1
• -2

How many protons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?

• 20
• 10
• 2
• 18

How many protons are in this element?

• 79
• 196
• 117
• Cannot be determined

What charge does an atom have if it LOSES an electron? 

• Positive (+)
• Negative (-)

When an atom LOSES an electron it is a

• cation
• anion