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