17 Cl 35.45
Chlorine
diatomic nonmetal
Properties
- Atomic number
- 17
- Atomic mass
- 35.45 u
- Category
- diatomic nonmetal
- Group
- 17
- Period
- 3
- Block
- p-block
- State (room temp)
- Gas
- Outer-shell electrons
- 7
- Electronegativity
- 3.16 (Pauling)
- Density
- —
- Melting point
- -101.55 °C
- Boiling point
- -34.04 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁵
Noble-gas shorthand: [Ne] 3s² 3p⁵
Electrons per shell: 2, 8, 7 — that's 7 in the outermost shell.
About Chlorine
Chlorine is a chemical element with symbol Cl and atomic number 17. It also has a relative atomic mass of 35.5. Chlorine is in the halogen group (17) and is the second lightest halogen following fluorine.
- Discovered by Carl Wilhelm Scheele
- Appearance: pale yellow-green gas
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.