Question

Thomson's model of atom.

Answer 1

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Here's ur answer...

Postulates of Thomson’s atomic model

Postulate 1: An atom consists of a positively charged sphere with electrons embedded in it

Postulate 2: An atom as a whole is electrically neutral because the negative and positive charges are equal in magnitude

Thomson atomic model is compared to watermelon. Where he considered:

Watermelon seeds as negatively charged particles

The red part of the watermelon as positively charged..

Hope it helps you buddy ☺ ☺...

Answer 2

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$\textbf{Answer}$:

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In 1898, J.J. Thomson gave the first explanation about the arrangement of positive charges and the electrons inside the atom.

According to him, an atom is a sphere of positive charges having radius of the order of $10^-10$ m. The positive charges is uniformly distributed over the entire sphere and the electrons are embedded in the sphere of positive changes just like seeds in a watermelon or plums in the pudding.

Thomson's atom model is also known as plum pudding model. The total positive charge inside the atom is equal to the total negative charge carried by electrons, so that every atom is electrically neutral. The electrons were supposed to be located in the cloud of positive charges, such that the system is stable.

If the atom gets slightly perturbed, the electrons in the atoms oscillate about their equilibrium position and result in the emission of radiation of definite frequencies in the form of infrared.


Failure of This model:

1. It could not explain the origin of the spectral lines in the form of series as in the case of hydrogen atom.

2. It couldn't account for the scattering of alpha particles through large angles as observed in the case of Rutherford's alpha scattering experiment.



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