Rubidium

Alkali metal

Symbol: Rb

Atomic Number: 37

Standard State: Solid

Atomic Mass: 85.468

Electron Configuration: [Kr]5s1

Electronegativity: 0.82

Atomic Radius: 303

Ionization Energy: 4.177

Melting Point: 312.46

Boiling Point: 961

Density: 1.53

Year Discovered: 1861