Lithium

Li

Atomic # = 3

Mass # = 7

Family = Alkali metal

Sodium

Na

Atomic # = 11

Mass # = 23

Family = Alkali metal

Potassium

K

Atomic # = 19

Mass # = 39

Family = Alkali metal

Rubidium

Rb

Atomic # = 37

Mass # = 85

Family = Alkali metal

Caesium

Cs

Atomic # = 55

Mass # = 133

Family = Alkali metal

Francium

Fr

Atomic # = 87

Mass # = 223

Family = Alkali metal

Beryllium

Be

Atomic # = 4

Mass # = 9

Family = Alkaline earth metal

Magnesium

Mg

Atomic # = 12

Mass # = 24

Family = Alkaline earth metal

Calcium

Ca

Atomic # = 20

Mass # = 40

Family = Alkaline earth metal

Strontium

Sr

Atomic # = 38

Mass # = 88

Family = Alkaline earth metal

Barium

Ba

Atomic # = 56

Mass # = 137

Family = Alkaline earth metal

Radium

Ra

Atomic # = 88

Mass # = 226

Family = Alkaline earth metal