Ion and Ion Formation

An atom that gains electrons is known as an:

• anion

• cation

How many electrons are in the valence (outer) shell of the sodium ion? 

• 10

• 2

• 4

• 8

Why is this sodium ion positive?

• It gained electrons

• It lost electrons

How many electrons are in the valence shell of the oxide ion?

• 8

• 6

• 2

• 10

How many electrons will this calcium atom lose?

• 6

• 8

• 2

• 20

How many electrons will chlorine gain to become stable?

• 2

• 1

• 6

• 8

When ions form they have the electron configuration of:

• Halogens

• Noble Gas

• Alkali Metals

• Alkaline Earth Metal