Atomic Number (# of protons)

9

Mass (amu)

19.00

Density

1.70 g/liter (0⁰C, 1 atm)

Electron Configuration

1s²2s²p⁵

Oxidation States (bold = most stable)

-1

Atomic Radius (pm)

71

Ionic Radius (pm)

(-1)133

Electronegativity

4.1

Melting Point (⁰C, 1 atm)

-220

Electron Affinity (eV)

3.40

Boiling Point(⁰C, 1 atm)

-188

1^st Ionization energy (eV)

17.42

Enthalpy of Fusion (kJ/mole)

0.26

2^nd Ionization Energy (eV)

Enthalpy of Vaporization (kJ/mole)

3.31

3^rd Ionization Energy (eV)

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

0.82