Question

what is the difference between atom and molecule

Answer 1

atom is the smallest particle of an element that may or may not exist independently
where-else,
molecule is a group of atom and is the smallest particle of an element or a compound that exist independently ..... 
i hope it helps.........

Answer 2

ATOM:-
1.atom is indivisible
2.it does not exists freely in nature
3.it does not bear any relevant properties
4.atoms are oval in shape
MOLECULE:-
1.molecule are divisible
2.it exists freely in nature
3.it bear all the relevant properties
4.molecules are geometrical in shape