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History of the Atom

According to ...

Question

According to J.J.Thomson's atomic model, where are the negative charges of an atom embedded in?

A

A lump of positive charge

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B

A lump of small atoms

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C

A lump of neutrons

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D

The nucleus

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Solution

The correct option is D A lump of positive charge
JJ Thompson proposed that an atom possesses a spherical shape in which the positive charge is uniformly distributed and the electrons are embedded into it in such a manner as to give the most stable electrostatic arrangement.

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Q. The model of an atom according to which “An atom contains negatively charged particles called electrons embedded uniformly throughout a thinly spread positively charged spherical mass” is

Q. The statements gives below are the postulates of various atomic models. Arrange them in their chronological order.
(a) Fine structure is due to the presence of sub shells in the main energy level.
(b) The size of an atom is much larger than the size of its nucleus.
(c) As long as the electron is present in a particular orbit, its energy remains constant.
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According to J.J Thomson, an atom is a positively charged sphere. Which sub atomic particles are embedded in it?

Q. An early model for an atom considered it to have a positively charged nucleus of charge

Z e

surrounded by a uniform density of negative charge up to a radius

R

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