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Atomic Number	17

Atomic Symbol	Cl

Atomic Weight	35.4527 amu

Group	Halogen, 17

Form	Gas

Density @ STP	3.111 g/L

Melting Point	-101.5 °C (-150.7 °F, 171.7 °K)

Boiling Point	-34.04 °C (-29.27 °F, 239.11 °K)

Heat of Fusion	6.40 kJ/mol

Heat of Vaporization	20.41 kJ/mol

First Ionization Potential	12.96764 eV

Electronegativity (on Pauling scale	3.16

Specific Heat Capacity	0.479 J/g K

Ground State Electron Configuration	3p⁵

Oxidation State(s)	+1, +5, +7, -1

Stable Isotopes and Natural Abundance on Earth	³⁵Cl, 75.77%; ³⁷Cl, 24.23%

Atomic Radius	79 pm

Crystal Structure	Orthorhombic

Discovered by	Scheele, 1774