J.J. Thompson's plum pudding model was devised after the
discovery of electron but before the discovery of the nucleus of the atom.
Rutherford, who overturned Thompson's plum pudding model proposed that on
his experiment (Rutherford model) he discovered that the atom has a tiny, heavy
nucleus, which is named as nucleus of the atom. While the most important properties of atomic and molecular structure was explained using the simple [picture of
an atom called the Bohr Model. This model was proposed by Niels Bohr. He also
concluded that an atom is a small, positively charged nucleus
surrounded by orbiting electrons.
The
different theories and discoveries by the great scientists mentioned above
demonstrate the atomic model and composition of atoms.
