An atom is the most basic
building block of matter of a substance. Any
physical substance is made up of atoms that repeat themselves through out
the substance. It is the smallest indivisible part of the
substance, that contributes to physical and chemical properties of a
Any substance consists of
atoms arranged in some structure and some free space between them.
It consists of subatomic
particles called electrons, protons and neutrons. The size of
an atom is in pico meters and is invisible to the eyes.
The chemical elements that we hear
like hydrogen, oxygen are composed of their respective atoms. A good
example that we can give is, a school is like matter of
a substance. Then rooms in the building are like atoms. The
smallest building block of the building. Further, in a beehive there are
many rooms for the bees, each room is like an atom.