As

ARSENIC

Definition :From 'arsenikos' or mole.A semimetallic elementnoted for being poisonous although some of its compounds are medicinal.

Discovery :1250 by albertus magnus of germany

Uses :hardenic chots, laser materials, poisons

Group of Elements :Metalloids(Solid)

Atomic Weight :74.92160

Oxidation State :+3,5

Melting Point :817

Boiling Point :613

Density :5.72 g/cm3

Electronegativity :2.0