Question

Electron was discovered by _________.
1. Albert Einstein
2. J. J. Thomson
3. E. Rutherford
4. James Chadwick

Answer 1

Correct Answer - Option 2 : J. J. Thomson

CONCEPT:

• The discovery of the electron is credited to J J Thomson.
• Electron is a negatively charged particle.
• The below table shows the discovery of other subatomic particles also:

	Discoverer	Year of Discovery
Proton	E. Rutherford	1909
Neutron	James Chadwick	1932
Electron	J.J. Thomson	1897

EXPLANATION:

• The discovery of the electron is credited to J J Thomson.
• The scientist searched cathode rays for the carrier of the electrical properties in the matter which leads to the discovery of the electron particles.
• So the correct answer is option 2.