Question

cbse class 9 subject science ch3 atoms and molecules topic 3.2 what is atoms and molecules notes​

Answer 1

Answer:

ATOMS: are the smallest unit of particles

MOLECULES: are the particle which contain 2 or more atoms which exist independently...

Answer 2

ATOMS :

Atoms are the smallest particles of an element which can take part in a chemical reaction.

size on an atom : atomic radius is measured in nanometres.

1 nm = 1/10^9m

1 m = 10^9 nm

atomic radii of hydrogen atom=1×10^-9m.