Nuclear theory of the atom was put forward by:
C.Neil’s Bohr
D.J.J. Thomson

Answer Verified Verified
Hint: We must know that Ernest Rutherford discovered the nucleus of the atom. Ernest Rutherford put forward the nuclear structure of the atom, discovered alpha and beta rays, and also projected the laws of radioactive decay.

Complete step by step answer:
We must know that the nuclear theory of the atom was put forward by Rutherford. Nowadays we know the Rutherford's atomic model now popularly known as the nuclear model. Following main points are concluded in nuclear model:
The nucleus is the tiny, dense, central core of the atom that comprises protons and neutrons.
The protons and neutrons in the nuclear atom comprise nearly all of the mass of the atom, and are located in the nucleus at the center of the atom.
This concentrated central mass is responsible for deflecting both alpha and beta particles.
The electrons are distributed around the nucleus that revolve in an orbit and occupy most of the volume of the atom.
The atom is about 105 times the diameter of the nucleus. This could be correlated with putting a grain of sand in the middle of a football field.
Hence, Option A is correct.

Also, we must know the Bohr model of the atom was developed by Niels Bohr Danish physicist, in which he projected that energy levels of electrons are discrete and electrons revolve in stable orbits around the atomic nucleus.
Sir Joseph John Thomson (J J Thomson) was a British physicist who discovered the first subatomic particle, the electron.
Francis William Aston was a Physicist and is well known for his discovery of many non-radioactive elements and for the whole number rule.