Basic Information

Name: Krypton 
Symbol: Kr 
Atomic Number: 36 
Atomic Mass: 83.8 amu 
Melting Point: -157.2 °C (115.950005 K, -250.95999 °F) 
Boiling Point: -153.4 °C (119.75001 K, -244.12 °F) 
Number of Protons/Electrons: 36 
Number of Neutrons: 48 
Classification: Noble Gas 
Crystal Structure: Cubic 
Density @ 293 K: 3.74 g/cm3 
Color: colorless gas
Date of Discovery: 1898 
Discoverer: Sir William Ramsay 
Name Origin: From the Greek word kryptos (hidden) 
Uses: Lighting 
Obtained From: production of liquid air