Periodic table of the elements
GermaniumArsenicSelenium
33
As
Arsenic
74.92160
2
8
18
5
33
As
Arsenic
74.92160
2
8
18
5
General
NameArsenic
SymbolAs
Number33
Chemical seriesMetalloids
Group / Period15 / 4
Blockp-block
CAS registry number7440-38-2

Physical properties
Statesolid
Density5.727 g/cm3
Melting point1090 K (817°C, 1503°F)
Boiling point887 K (614°C, 1137°F)
Critical point

Atomic properties
Atomic Weight74.92160 g/mol
Crystal structurerhombohedral
Electronegativity2.18
Atomic radius115 pm
Atomic radius (calculated)114 pm
Electron configuration[Ar] 4s2 3d10 4p3
Electrons per shell2, 8, 18, 5
Number of protons33
Number of neutrons42

Other languages
SpanishArsénico
PortugueseArsénio
FrenchArsenic
GermanArsen
ItalianArsenico
RussianМышьяк
PolishArsen
Chinese
Arabicزرنيخ
TurkishArsenik
DutchArseen


Periodic table of the elements
GermaniumArsenicSelenium