All chemical elements

Symbol

Cl

Atomic number

17

Chemical property

Reactive nonmetal

Origin o the name

the Greek chloros, 'greenish yellow'

Group

17

Period

3

Atomic weight (u)

35.45

Density (g/cm³)

0.003214

Melting point (K)

171.6

Boiling point (K)

239.11

Heat capacity (J/(g·K))

0.479

Electro-negativity

3.16

Abundance in earth's crust (mg/kg)

145