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2015-12-30T20:01:09+05:30
Rutherford overturned Thomson's model in 1911 with his well-known gold foil experiment in which he demonstrated that the atom has a tiny, heavy nucleus. Rutherford designed an experiment to use the alpha particles emitted by a radioactive element as probes to the unseen world of atomic structure.Rutherford presented his own physical model for subatomic structure, as an interpretation for the unexpected experimental results. In it, the atom is made up of a central charge (this is the modern atomic nucleus, though Rutherford did not use the term "nucleus" in his paper) surrounded by a cloud of (presumably) orbiting electrons. In this May 1911 paper, Rutherford only commits himself to a small central region of very high positive or negative charge in the atom. 

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2015-12-30T20:03:42+05:30
Postulates of rutherford's atomic model-
A. Matter in an atom is located in the space called nucleus which is associated with all the positive charge of the atom while the remaining volume being large empty space.
B.since the atom is neutral sufficient number of electrons must surround the nucleus to counterbalance the positive charge and revolve around the nucleus with great velocity to confer the stability on the nuclear model of the atom 

DRAWBACKS OF RUTHERFORD'S ATOMIC MODEL-

A.in rutherford's atomic model the electrons revolve around the nucleus and the attractive force of the +vely charged nucleus would be balanced by the centrifugal force arising due to the rotation of the electrons 

B.if an electron moves round the nucleus it must radiate out energy and gradually move towards the nucleus following a spiral path till it collides and ultimately collapse in it.

C.thus, rutherford's model could not explain correctly the stabilty of an atom
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