Basic Information
Name:arsenic
Symbol:ar
Classification:Arsenic is a metalloid
color:gray
Atomic weight : 74.9216
state: solid
Melting Point: 817 oC, 1090 K
Boiling Point: 614 oC, 887 K
Shells:2,8,18,5
Electron configuration:[Ar] 3d10 4s2 4p3
Density @ 20oC:5.776 g/cm3
Atomic volume:12.97 cm3/mol
Structure: rhombohedral; layers of 6-member rings
3.5 mohs