Question

what is the atoms and moclues?

Answer 1

atoms and molecules are structural parts of matter

atoms- smallest part of matter which cant be split.consists of protons, neutrons, electrons
molecules-made up of diff. atoms

Answer 2

atoms are the smallest particles of any matter that may or may not exist independently .
molecules are the groups of atoms . atoms combine to be stable and then they are called as molecules .
  i hope it helps.......................^_^