Rubidium was discovered by Robert Bunsen, Gustav Kirchhoff at 1861 in Germany.
Origin of name: from the Latin word "rubidius" meaning "dark red" or "deepest red".
Atomic Number: 37
Atomic Weight: 85.4678
Melting Point: 312.46 K (39.31°C or 102.76°F)
Boiling Point: 961 K (688°C or 1270°F)
Density: 1.53 grams per cubic centimeter
Phase at Room Temperature: Solid
Element Classification: Metal
Period Number:5 Group Number: 1 Group Name: Alkali Meta