rutherford atomic model

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Ruther ford model of an atomPower point presentation

Presented by:

Ruther Ford GroupT.SandeepN.VamsiS.Mohammed.Asif

V.Yugandhar

Ernest Rutherford (1871-1937)

Learned physics in J.J. Thomson’ lab.

He is known as father of nuclear physics.

He is famous for his Gold-foil experiment

Animation by Raymond Chang – All rights reserved.

He born on 30-8-1871

Rutherford ‘Scattering’

• In 1909 Rutherford undertook a series of experiments• He fired a (alpha) particles at a very thin sample of gold foil• According to the Thomson model the a particles would only

be slightly deflected• Rutherford discovered that they were deflected through large angles

and could even be reflected straight back to the source

particlesource

Lead collimator Gold foil

a

q

Rutherford Scattering (cont.)

Rutherford interpreted this result by suggesting that the a particles interacted with very small and heavy particles

Particle bounces off of atom?

Particle attracts to atom?

Particle goes through atom?

Particle path is alteredas it passes through atom?

.

Case A

Case B

Case C

Case D

What he got…richochetingalpha particles

Rutherford’s ApparatusRutherford received the 1908 Nobel Prize in Chemistry for his pioneering work in nuclear chemistry.

Rutherford Experiment

a-rays

DRAWBACKS OF RUTHERFORD MODEL OF ATOMThe Rutherford,s model explains the stucture of atom is very simple way. But it suffers from the following drawbacks:1.Ruterford proposed that electron revolve at a high speed in circular orbit around the positively charged nucleus .When a charged particle i.e., electron revolve around positively charged nucleus, it need to be accelerated so as keep it moving in circular orbit

2.However according to electromagnetic theory,whenever a charged particle such as electron is accelerated around another charged centre[nucleus]which are under force of attraction, there would be continuous radiations of energy. This loss of energy would slow down the speed of the electron and eventually the electron would fall into the nucleus atom would collapse. But such collapse does not occur. Thus, Rutherford,s model could not explain the stability of atom.

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