Atom:
An atom is the smallest particle of an element which can take part in chemical reaction. Atom consists sub-atomic particles like electron, proton, neutron etc.
An atom is the smallest particle of an element which can take part in chemical reaction. Atom consists sub-atomic particles like electron, proton, neutron etc.
Molecule:
Molecule is the smallest particles of substance and has free existance
eg. H2, N2,CO2, NH3 etc.