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, which is 7 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
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
Chlorine: frequently asked questions
- What is Chlorine?
- Chlorine (Cl) is the chemical element with atomic number 17. It is a nonmetal (diatomic nonmetal).
- What is the atomic number of Chlorine?
- Chlorine's atomic number is 17, which means every Chlorine atom has 17 protons in its nucleus.
- What is the electron configuration of Chlorine?
- The electron configuration of Chlorine is 1s2 2s2 2p6 3s2 3p5 (noble-gas shorthand: [Ne] 3s2 3p5). Its electrons are arranged in shells of 2, 8, 7, with 7 in the outermost shell.
- Is Chlorine a metal or a nonmetal?
- Chlorine is a nonmetal (diatomic nonmetal).
- What group and period is Chlorine in?
- Chlorine is in group 17 and period 3 of the periodic table.
- Is Chlorine a solid, liquid, or gas?
- At room temperature, Chlorine is a gas.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.