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Positive Rays and Neutrons

Who determine...

Question

Who determined the mass of a neutron?

A

John Dalton (early 1800's)

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B

Ernest Rutherford (1911)

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C

Niels Bohr (1913)

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D

James Chadwick (1932)

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Solution

The correct option is C James Chadwick (1932)
The presence of neutron and its mass was determined by James Chadwick. Neutron was discovered by bombarding $α -$ particles on $B e$ . On doing so, highly energetic beam of radiation was observed by Chadwick. Thus mass of neutron was determined by James Chadwick.

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Q. Question 30
Match the names of the Scientists given in Column A with their contributions towards the understanding of the atomic structure as given in Column B.

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