Basic Information

Name: Rubidium 
Symbol: Rb 
Atomic Number: 37 
Atomic Mass: 85.4678 amu 
Melting Point: 38.89 °C (312.04 K, 102.002 °F) 
Boiling Point: 688.0 °C (961.15 K, 1270.4 °F) 
Number of Protons/Electrons: 37 
Number of Neutrons: 48 
Classification: Alkali Metal 
Crystal Structure: Cubic 
Density @ 293 K: 1.532 g/cm3 
Color: silver
Date of Discovery: 1861 
Discoverer: R. Bunsen 
Name Origin: From the Latin word rubidus (red) 
Uses: catalyst, photocells 
Obtained From: lithium production