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Rutherford's model of atom : This model of atom was given by Rutherford. According to him each atom have tiny core at its centre which is called nucleus of the atom. In the nucleus whole mass and positive charge of the nucleus is concentrated. The size of the nucleus is of the order of \( 10^{-15} \mathrm{~m} \) and atomic size is about \( 10^{-10} \mathrm{~m} \). The nucleus of the atom is surrounded by a number of electrons. But whole atom is electrically neutral. These electrons revolve in certain orbits around the nucleus of an atom the electrons get centripetal force from the electrostatic force between nucleus and electrons.
Atom is electrically:
(A) Positive
(B) Negative
(C) Earthed
(D) Neutral
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