PERIODIC ELEMENT
As (Arsenic)

 



Atomic number : 33
Atomic mass : 74.9216 g.mol-1
Electronegativity according to Pauling : 2.0
Density : 5.7 g.cm-3 at 20 °C
Melting point : 814 °C (36 atm)
Boiling point : 615°C (sublimation)
Vanderwaals radius : 0.139 nm
Ionic radius : 0.222 nm (-2) ; 0.047 (+5) ; 0.058 (+3)
Isotopes : 8
Electronic shell : [Ar] 3d10 4s24p3
Energy of first ionisation : 947 kJ.mol-1
Energy of second ionisation : 1798 kJ.mol-1
Energy of third ionisation : 2736 kJ.mol-1
Standard potential : - 0.3 V (As3+/ As)
Discovered by : The ancients
 
Atomic Structure Uses (Poison, conducts electricity, semiconductors)