Noble Gases

Elements

• Helium
• Neon
• Argon
• Krypton
• Xenon
• Radon

Facts About Noble Gases

• Around 1895 noble gases were discovered.
• These gases are rare.
• The gas Helium exists in the sun.
• Noble gases can be found in group 18 on the periodic table.

"In The Real World"

• The gas Argon is found in the common light bulb.
• The gas Helium is used for diluting the pure oxygen in deep-sea diving tanks.
• The gas Helium is also used for inflating balloons.
• The gas Neon is used in sign tubing.

Helium

Helium

Helium
Atomic Number 2
Atomic Mass 4.002602 u ± 0.000002 u
Non-metal
Density 0.178*10 -3 g.cm -3 at 20 °C (float)

"In The Real World"

• Helium can be used as light weight aircraft fuel.
• Divers use helium and oxygen when they dive.
• Helium can be used for breathing observation. It is essential for treating asthma, emphysema and other conditions that affect breathing.

"In the Real World"
Helium

Interesting Facts

• Helium was discovered in the sun's atmosphere before it was found on earth.
• Helium is so light that earth's gravity is not strong enough to hold onto it.
• When helium atoms are released into the atmosphere they rise until they escape into space.
• Helium is the second most abundant element in the universe.

Historical Facts

• French and English astronomers Pierre Janssen and Norman Lockyer are jointly credited with discovering helium after spectral analysis of sunlight following a solar eclipse in 1868.
• The word helium comes from the Greek word meaning sun (helios). It was named by Lockyer and English chemist Edward Frankland.