Element: Arsenic (As)

Element (Atom) NameArsenic
Physical state at room temperatureSolid
Element ClassificationSemi-metal
Group NamePnictogen
Period Number (Periodic table) 4
Group number (Periodic table)15
Atomic number33
Atomic weight74.921595 (Ref: Jlab-ele033, ciaaw-arsenic, Nist-33)
74.92 (Ref: Lanl-33)
Atomic Radius185 pm (Van der Waals) (Ref: Lanl-33)
Density5.776 g/ml (Ref: Jlab-ele033)
Melting point817°C (Ref: Jlab-ele033, Lanl-33)
Boiling point614°C (Ref: Jlab-ele033)
603 °C (Ref: Lanl-33)
Electron shell configuration1s2 
2s2 2p6
3s2 3p6 3d10 
4s2 4p3
Oxidation States+5, +3, -3 (Ref: Jlab-ele033)
5, 4, 3, 2, 1, −1, −2, −3 ​(a mildly acidic oxide) (Ref: Lanl-33)
Ionization Energy9.815 eV (Ref: Jlab-ele033)
9.78855  eV (Ref: Nist-33)
Number of Stable Isotopes1
InChIInChI=1S/As (Ref: Pubchem-33)


  • Jlab-ele033: https://education.jlab.org/itselemental/ele033.html
  • Lanl-33: https://periodic.lanl.gov/33.shtml
  • ciaaw-arsenic: https://www.ciaaw.org/arsenic.htm
  • Nist-33 : https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=33
  • Pubchem-33: https://pubchem.ncbi.nlm.nih.gov/element/33
  • science.co.il: https://www.science.co.il/elements/

Was this post helpful?

Author: admin

34 thoughts on “Element: Arsenic (As)

Leave a Reply

Your email address will not be published. Required fields are marked *