Atomic Number (# of protons)

17

Mass (amu)

35.45

Density

3.21 g/liter (0⁰C, 1 atm)

Electron Configuration

[Ne]3s²p⁵

Oxidation States (bold = most stable)

+1,-1,3,5,7

Atomic Radius (pm)

99

Ionic Radius (pm)

(-1)181

Electronegativity

2.8

Melting Point (⁰C, 1 atm)

-101

Electron Affinity (eV)

3.61

Boiling Point(⁰C, 1 atm)

-34

1^st Ionization energy (eV)

12.97

Enthalpy of Fusion (kJ/mole)

3.38

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

10.21

3^rd Ionization Energy (eV)

Specific Heat Capacity ( J/ (g K), 25⁰C, 1 atm)

0.48