Periodic Table- Noble Gases -

Noble Gases

• Fairly nonreactive• Complete valence shell• High ionization energies• Very low electronegativities• Low boiling points (all gases at room temperature)

　 Atomic Radius

Boiling Point

Melting Point

He 1.400 -268.6 -272.0Ne 1.540 -246.1 -248.6Ar 1.880 -186.0 -189.3Kr 2.020 -153.4 -157.2Xe 2.160 -108.1 -111.9Rn 2.200 -61.8 -71.0 He Ne Ar Kr Xe Rn

0.000

0.500

1.000

1.500

2.000

2.500Atomic Radius

He Ne Ar Kr Xe Rn

-300.0

-250.0

-200.0

-150.0

-100.0

-50.0

0.0Boiling Point

He Ne Ar Kr Xe Rn

-300.0

-250.0

-200.0

-150.0

-100.0

-50.0

0.0

Melting Point

Uses

He Balloons, Deep Sea Diving

Ne Liquid Air

Ar Lighting

Kr Lighting

Xe Powerful Lamps, Bubble Chambers

Rn Treatment of Cancer

Abundance in Earth’s Crust (mg/kg)

He 8 x 10^-3

Ne 5 x 10^-3

Ar 3.5

Kr 1 x 10^-4

Xe 3 x 10^-3

Rn 4 x 10^-13