Symbol	As	Atomic radius: pm	125	Fusion: kJ/Mole	24.44
Name	Arsenic	Ionic radius: pm	(+3)58	Boiling point: °C	603sp
Atomic number	33	Electron affinity	0.81	Melting point: °C	817tp
Atomic weight	74.92	1st  ion potential	9.81	Specific Heat Cap: J/(g K)	0.33
Classification	Metalloid	Natural form	Solid	Thermal Cond: W/(cm K)	0.50
Configuration	[Ar]3d104s2p3	Crystal structure	Rhom	Electrical Cond	0.0345
Oxidation states	+/-3,5	Density	5.72	Abundance: mg/kg-crust	1.8
Electronegativity	2.18	Vaporization: kJ/Mole	31.9
Compounds of arsenic were known as early as the 4th century B.C., but it was not identified as an element until 1649.			Uses - photocells (combined with gallium), poisons, bronzing