As
Arsenic Symbol (As)
Arsenic is element 33 of the periodic table. Copy its symbol As and see its atomic weight, electron configuration and common compounds.
What does As mean?
As is the chemical symbol for arsenic, element number 33 in the periodic table. Arsenic is a metalloid in group 15, period 4. It is a toxic metalloid; gallium arsenide is an important semiconductor.
Codes and properties
| Chemical symbol | As |
|---|---|
| Atomic number (Z) | 33 |
| Atomic weight (PubChem) | 74.92159 |
| Group / period | 15 / 4 |
| Element category | metalloid |
| Electron configuration | [Ar]4s² 3d¹⁰ 4p³ |
| State at 20 °C | Solid |
| Oxidation states | +5, +3, -3 |
| Electronegativity (Pauling) | 2.18 |
| Melting point | 1090 K (816.85 °C) |
| Boiling point | 887 K (613.85 °C) |
| Density | 5.776 g/cm³ |
| Discovered | Known since ancient times |
| Common compounds | As₂O₃, GaAs |
How to type As
- Plain text: type
As— element symbols are ordinary Latin letters, with the first letter capitalised and the second lowercase. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as As₂O₃ — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{As}in math mode, or use the mhchem package:\ce{As}. - HTML:
As; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for arsenic?
The chemical symbol for arsenic is As.
What is the atomic number of arsenic?
Arsenic has atomic number 33, meaning each atom has 33 protons.
What is the electron configuration of arsenic?
The ground-state electron configuration of arsenic is [Ar]4s² 3d¹⁰ 4p³.
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Reference: Arsenic on PubChem (NIH)