Arsenic
Arsenic
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Arsenic ΒΆ
AtomicNumber: 33
Element: Arsenic
Symbol: As
AtomicMass: 74.922
NumberofNeutrons: 42
NumberofProtons: 33
NumberofElectrons: 33
Period: 4
Group: 15.0
Phase: solid
Radioactive: nan
Natural: yes
Metal: nan
Nonmetal: nan
Metalloid: yes
Type: Metalloid
AtomicRadius: 1.3
Electronegativity: 2.18
FirstIonization: 9.7886
Density: 5.78
MeltingPoint: 1090.15
BoilingPoint: 887.0
NumberOfIsotopes: 14.0
Discoverer: Albertus Magnus
Year: 1250.0
SpecificHeat: 0.329
NumberofShells: 4
NumberofValence: 5.0