Basic Information

Name: Astatine 
Symbol: At 
Atomic Number: 85 
Atomic Mass: (210.0) amu 
Melting Point: 302.0 °C (575.15 K, 575.6 °F) 
Boiling Point: 337.0 °C (610.15 K, 638.6 °F) 
Number of Protons/Electrons: 85 
Number of Neutrons: 125 
Classification: Halogen 
Crystal Structure: Unknown 
Density @ 293 K: Unknown 
Color: Unknown
Date of Discovery: 1940 
Discoverer: D.R. Corson 
Name Origin: From the Greek word astatos (unstable) 
Uses: No uses known 
Obtained From: Man-made