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33
  As  
74.921600
Arsenic
      


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Name: Arsenic
Symbol: As
Atomic Number: 33
AtomicWeight: 74.921600
Family: metalloids
CAS RN: 7440-38-2
Description: A steel grey, very brittle, crystalline, semimetallic (metalloid) solid
State (25 °C): Solid
Melting Point: 1090á7 °K
Boiling Point: 887 °K
Density: 5.776 g/cm3
Oxidation states: +3,+5,-3
Electron Configuration: [Ar] 3d104s24p3
Radius: 115 pm (Covalent)
Electronegativity: 2.18 (Pauling Scale)

1st Ionization Energy: 947 KJ/mole
2nd Ionization Energy: 1798 KJ/mole
3rd Ionization Energy: 2735 KJ/mole

      



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