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Introduction

Case Study

Group VIII elements are called Noble gases.

They are all non metals.

 Noble gases occupy about 1.0% of the atmosphere as colourless gaseous mixture.

 Argon is the most abundant with 0.9%.

They exists as monatomic molecules with very weak van-der-waals /intermolecular forces holding the molecules. they include;

Element

Symbol

Atomic number

Electron structure

State at room temperature

Helium

He

2

2:

Colourless gas

Neon

Ne

10

2:8

Colourless gas

Argon

Ar

18

2:8:8

Colourless gas

Krypton

Kr

36

2:8:18:8

Colourless gas

Xenon

Xe

54

2:8:18:18:8

Colourless gas

Randon

Rn

86

2:8:18:32:18:8

Radioctive

What is common in all the noble gases?