Question

thomsan's atomic model

Answer 1

The plum pudding model is one of several scientific models of the atom. First proposed by J. J. Thomson in 1904  soon after the discovery of the electron, but before the discovery of the atomic nucleus, the model represented an attempt to consolidate the known properties of atoms at the time: 1) electrons are negatively-charged particles and 2) atoms are neutrally-charged.

Answer 2

Thomsan's Atomic model :-

◼ He proposed that the positive charge is spread over a sphere in which the electrons are embedded to make the atom as the whole nuteral.

◼This model is compared with a watermelon in which seeds are embedded or with a cake or pudding in which raisins (dried grapes / kishmish ) are embedded. That is why this model is sometimes called raisen watermelon or watermelon model .

OR

✒An atom posses a spherical shape in which the shape in which the positively charge is uniformly distributed. The electrons are embedded into such a manner as to give the most stable electrostatic arrangements. This model was much like raisins in a pudding and is known as THOMSON'S PLUM PUDDING MODEL.

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✒LIMITATION:−

✔ Though this model was able to explain the overall neutrally of the atom.

✔It could not satisfactorily explain the results of scattering experiments , carried out by RUTHERFORD in 1911 and was rejected.

✔ This model was discarded as it was not consistent with the results of further investigations such as scattering of

α (alpha ) - particles by thin metal foils.

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