Question

______ discovered the presence of neutrons inside an atom.
1. E. Goldstein
2. J. Chadwick
3. J. J. Thomson
4. Niels Bohr

Answer 1

Correct Answer - Option 2 : J. Chadwick

Neutrons:

• A 'Neutron' is a subatomic particle, symbol n or n⁰, which has a neutral charge and a mass slightly greater than that of a proton. 
• The Neutron is essential to the production of nuclear power.
• In the decade after the neutron was discovered by James Chadwick in 1932.
• Protons and Neutrons constitute the nuclei of atoms.​

​Thus, J. Chadwick discovered the presence of neutrons inside an atom.

Name	Discovered	Year
Wilhelm Röentgen	X-Ray	1895
Neils Bohr	hydrogen atom structure and its spectrum	1913
J J Thomson	Electron	1897
James Chadwick	Neutron	1932
Goldstein	Proton	1886
John Dalton	Atomic Theory	1808