Group 18 of the periodic table consists of the noble gases: helium, neon, argon, krypton, xenon, and radon. These elements have full outer electron shells, making them very unreactive chemically. They have low densities, melting and boiling points, are colorless, and poor conductors of heat and electricity. Various noble gases have important industrial and medical uses, such as filling weather balloons, neon signs, light bulbs, lasers, cancer treatment, and more.

1. PERIODIC TABLE OF
ELEMENTS
Group 18 Elements

2. GROUP 18 ELEMENTS
• Group 18 elements consist of Helium, Argon, Krypton, Xenon and Radon.
• These elements are known as Noble Gases.
• These elements are unreactable chemically, since they have achieved stable octet electron
arrangement except for helium is stable duplet electron arrangement
• There is no need to donate or share electrons

3. ELECTRON ARRANGEMENTS
Noble Gases Electron arrangement
Helium 2
Neon 2.8
Argon 2.8.8
Krypton 2.8.18.8
Xenon 2.8.18.18.8
Radon 2.8.18.32.18.8

4. PHYSICAL PROPERTIES
• It has very small atomic mass
• Colourless at room temperature and pressure
• Noble gases have low melting and boiling point
• They also have low densities
• The atomic sizes increases as the number of occupied shells in the atom increases from
helium to radon
• Insoluble in water
• Cannot conduct electricity
• Poor conductors of heat

5. USES OF GROUP 18 ELEMENTS
• Helium gases are used to fill airships and weather balloons
• Neon gases are used advertising lights and television tubes
• Argon gases are used to fill in light bulbs
• Krypton gases is used in lasers to repair the retina of the eye and to fill
photographic flash lamps
• Radon is used in treatment of cancer
• Xenon Is used in making electron tubes and stroboscopic lamps

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