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Arsenic (As)
Atomic number 33 · Metalloid
| Atomic number | 33 |
|---|---|
| Atomic mass | 74.92159 u |
| Molar mass | 74.92159 g/mol |
| Category | Metalloid |
| Group / period / block | 15 / 4 / p |
| Electron configuration | [Ar] 3d10 4s2 4p3 |
| Electrons per shell | 2, 8, 18, 5 |
| Electronegativity (Pauling) | 2.18 |
| Atomic radius | 115.0 pm |
| Density | 5.75 g/cm³ |
| First ionisation energy | 9.7886 eV |
| Boiling point | 889.15 K (616.00 °C) |
| Common oxidation states | -3, +3, +5 |
| Abundance in Earth's crust | 1.8 ppm |
Uses
Semiconductors (GaAs), wood preservative
Discovery
Known since ancient times