Atom Atom is a Greek word which means indivisible they believed that matter can be broken down into very small indivisible particles . 1. In other words we can say atoms are fundamental building blocks of matters. 2. Matter composed of three subatomic particles the proton ,the neutron and therefore the electrons. 1. In other words we can say atoms are fundamental building blocks of matters. 2. Matter composed of three subatomic particles the proton ,the neutron and therefore the electrons. Atomic theories. The atomic theory given by maharishi kanad . an ancient indian scientist and philosopher propounded a theory of atom.He explain the creation and existence of the universe. 1 . He explain his atomic theory of matter in his book vaisheshika Sutra also called kanad Sutra . 2 . According to kanad everything can be subdivided . 3 . That subdivision leads to creation of parmanu ( atom) which are the sm