The periodic Table
coloured by Discovery
coloured by States
Constants, Astronomy
Constants, Physics
SI Units
by Peder Axensten

As


in WebElements
in X-Ray info 		As, 33
arsenic (English)
arsenic, m. (French)
Arsen, n. (German)
mysh'yak (Russian)
arsenik (Swedish)

Symbol, numberAs, 33 (semiconductor), Group: 15; 5A
Weight74.9216
In Nature
Discovered1250, by Albert the Great
Density  [kg/m3]5780a, 4700b [293 K] (solid)   
Molar volume12.95a, 15.9b cm3
Melting Temperature1090 K   (817 °C)   Enthalpy: 31.9 kJ/mol
Boiling Temperature889 K   (616 °C)   Enthalpy: 27.7 kJ/mol
Electrical resistance26E-8 [273 K] Wm
ThermalConductivity: 50a [300 K] W/Km     Expansion: 4.7E-6 /K
Configuration1s2 2s2p6 3s2p6d10 4s2p3
Ionisation [kJ/mol]
  M-->  M+--> M2+--> M3+--> M4+--> M5+--> M6+--> M7+--> M8+--> M9+-->M10+
Thermodynamics
State DfH° DfG° S° CpH H°298.15-H°0
[kJ/mol] [J/Kmol] [kJ/mol]
Isotopes
Mass In nature Half-life Spin m/mN NMM Decay
As