Arsen (As)
Arsen is the chemical element with atomic number 33 and symbol As. It is a metaloid in period 4, group 15, with a standard atomic weight of 74.922 u.
Fakta utama
- Z
- 33
- Atomic weight
- 74.922 u
- Category
- metaloid
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1300
- CAS
- 7440-38-2
Sifat terukur
| Property | Value | Source |
|---|---|---|
| Electronegativity | 2.18 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,090 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 887 K | National Center for Biotechnology Information (NIH) |
| Density stp | 5.776 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 185 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 947 kJ/mol | National Center for Biotechnology Information (NIH) |
| Electron affinity | 78.2 kJ/mol | National Center for Biotechnology Information (NIH) |
Konfigurasi elektron
- Noble gas notation
- [Ar] 3d¹⁰ 4s² 4p³
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p³
- Electrons per shell
- 2, 8, 18, 5