Atomic Number: 55

Atomic Weight: 132.90545196

Melting Point: 301.59 K (28.44°C or 83.19°F)

Boiling Point: 944 K (671°C or 1240°F)

Density: 1.93 grams per cubic centimeter

Phase at Room Temperature: Solid

Element Classification: Metal

Period Number: 6    

Group Number: 1    

Group Name: Alkali Metal