← Back to periodic table
Chlorine (Cl)
Atomic number: 17 · Category: diatomic nonmetal · Group 17 · Period 3 · Phase: Gas
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.
Atomic mass: 35.45
Density: 3.2
Melting point: 171.6 K
Boiling point: 239.11 K
Appearance: pale yellow-green gas
Source: Wikipedia
Block: p
CPK color:#1ff01f
Electronic structure
Electron configuration: 1s2 2s2 2p6 3s2 3p5
Configuration (semantic): [Ne] 3s2 3p5
Shells: 2, 8, 7
Electronegativity (Pauling): 3.16
Electron affinity: 348.575
Ionization energies: 1251.2, 2298, 3822, 5158.6, 6542, 9362, 11018, 33604, 38600, 43961, 51068, 57119, 63363, 72341, 78095, 352994, 380760
Periodic position
Group: 17
Period: 3
xpos: 17
ypos: 3
Spectral/Bohr images
Image
3D Model