Chlorine

Halogen

Symbol: Cl

Atomic Number: 17

Standard State: Gas

Atomic Mass: 35.45

Electron Configuration: [Ne]3s2 3p5

Electronegativity: 3.16

Atomic Radius: 175

Ionization Energy: 12.968

Melting Point: 171.65

Boiling Point: 239.11

Density: 0.003214

Year Discovered: 1774