Atom is the smallest block of any particle. It consist of electron proton and neutron. For example atom is brick,the molecule is the wall and the wall make the room like that atom make molecule and the molecule make tho substance.
Atul gautam (anonymous)
It is the smallest unit of any element which can be further divided
Pratyush pal (anonymous)
Atom is a smallest particle of substances very smallest particle it means it is not decided
it is the smallest particle of any substance. it can’t be divided into more parts.