The first model of an atom was given by _____________.

Question

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Answer 1

Sir J.J Thomson gave the first model of atom.
He by means of cathode-ray experiment discovered the existence of negatively charged particles in an atom which led to the discovery of electrons.
He gave the plum-pudding model of an atom in which electrons are embedded in atom-like currants.
Positive electrons are distributed all over the atom.
Hence, option (D) is correct.

Answer 2

Sir J.J Thomson gave the first model of atom.

He by means of cathode-ray experiment discovered the existence of negatively charged particles in an atom which led to the discovery of electrons.

He gave the plum-pudding model of an atom in which electrons are embedded in atom-like currants.

Positive electrons are distributed all over the atom.

Hence, option (D) is correct.