33As74.922
Arsenic
Metalloid · element 33 · group 15, period 4
Quick facts
| Symbol | As |
|---|---|
| Atomic number | 33 |
| Relative atomic mass | 74.922 |
| Category | Metalloid |
| Position | group 15, period 4 |
| State at 20 °C | Solid |
| Melting point | — |
| Boiling point | 615 °C |
| Density | 5.727 g/cm³ |
| Electronegativity | 2.18 |
| Electron configuration | [Ar] 3d10 4s2 4p3 |
About Arsenic
Arsenic has the symbol As and atomic number 33, which means every arsenic atom has 33 protons in its nucleus and, in a neutral atom, 33 electrons. At room temperature it is a solid.
Metalloids have properties between metals and non-metals. Several, like silicon, are semiconductors used in electronics.
Explore it
See where arsenic sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.