Basic Information

Name: Arsenic 
Symbol: As 
Atomic Number: 33 
Atomic Mass: 74.9216 amu 
Melting Point: 817.0 °C (1090.15 K, 1502.6 °F) 
Boiling Point: 613.0 °C (886.15 K, 1135.4 °F) 
Number of Protons/Electrons: 33 
Number of Neutrons: 42 
Classification: Metalloid 
Crystal Structure: Rhombohedral 
Density @ 293 K: 5.72 g/cm3 
Color: Gray
Date of Discovery: Known to the ancients 
Discoverer: Unknown 
Name Origin: From the Greek word arsenikos and the Latin word arsenicum 
Uses: Poison, conducts electricity, semiconductors 
Obtained From: mispickel