Class 9 Chemistry Atoms and Molecules Atoms

Atoms

According to John dalton all elements, compounds or mixtures are composed of some small particles which cannot be further divided into smaller particles. They are known as atoms. They are referred to as the basic building blocks of an element, compound or mixture. They are very small and their radius can be measured in nanometers.

Atomic radius is measured in nanometers . 1/109 m = 1 nm or 1m = 109 nm.

 

Example

Radii (in m)

Atom of hydrogen

10-10

Molecule of water

10-9

Molecule of haemoglobin

10-8

Grain of sand

10-4

 Ant

10-2

Watermelon

10-1

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