Question

Electrons were discovered by:
(A) Neils Bohr
(B) J.J. Thomson
(C) R.A. Millikan
(D) Rutherford

Answer 1

Hint: In this question, we need to comment on the discoverer of Electrons. For this, we will follow the atomic model of the atoms.

Complete step by step answer:
An atom is the smallest unit of the matter consisting of sub-components. An atom is neutral in nature. Atom is subdivided into negatively charged electrons and the positively charged nucleus which are arithmetically equal, and so, the atom is electrically neutral. A nucleus has been further consisting of positively charged Protons and the neutral neutrons.
Electrons are the key factor and the most prestigious discovery in the field of science, which was discovered by J.J. Thomson in the year of 1897.
Neils Bohr gave the Bohr’s atomic model which signifies that the negatively charged electrons revolve in the fixed orbit around the positively charged nucleus (protons and neutrons) which is fixed at the centre of the atomic structure. R.A. Millikan gave us the theory of the Photoelectric effect in the year 1910. From this theory, we were able to know the magnitude of the charge on an electron.Rutherford discovered the alpha and beta rays and proposed the law of radioactivity in the year of 1908.
Hence,option B is the correct answer.

Note: Discovery of;
-Electrons – J.J. Thomson in the year of 1897
-Protons - Ernest Rutherford in the year of 1909
-Neutrons - James Chadwick in the year of 1932