Name:  Arsenic

Atomic Symbol and Mass Number: As [33]

Electron Configuration: [Ar] 3d    4s   4p

Atomic Radii: 185 pm

Electron Affinity: 78 kJ mol-1

Oxidation states: –3, 0, +3, +5

Electronegativity value: 2.18

Elemental Group: Pnictogen

Uses and properties:

• Occurs in three distinct solid forms

• Commonly with a metallic sheen and conducts electricity (Gray arsenic)

• Metastable, poor electrical conductor and without a metallic sheen (Yellow arsenic)

• Glassy, brittle, and conducts electricity poorly (Black arsenic)

• Arsenic compounds are used in wood preservation and insecticides

• Semiconductor used in laser diodes and LEDs (Gallium arsenide)

• Used in lead alloys for ammunition

 

Lewis diagram: