Question

The first model of an atom was given by

• A. N. Bohr
• B. E. Goldstein
• C. Rutherford
• D. J.J. Thomson

Answer 1

The correct option is D

J.J. Thomson

Explanation for correct option:

(D) J.J. Thomson

Postulates of Thomson model of an atom:

“Thomson proposed the model of an atom identical to that of a Christmas pudding”.

• It is the first model of an atom.
• An atom is made up of a sphere that is positively charged and the electrons are placed in it.
• The magnitude of negative and positive charges is equal.
• Thus, the atom as a whole is electrically neutral.

Explanation for incorrect options:

A. N. Bohr discovered the quantum theory for an atom.

B. E. Goldstein discovered the positively charged particles.

C. Rutherford discovered the dense atomic nucleus by bombarding a thin gold sheet with alpha particles.

Hence, the correct option is D i.e. J.J.Thomson.