He deducted that all elements are composed of atoms. Atoms are indivisible and indestructible particles. Atoms of the same element are exactly alike while atoms of different elements are different. This theory became one of the foundations of modern chemistry.
The Danish Scientist proposed an improvement in his model, he placed each electron in a specific energy level. According to Bohr's atomic models, electrons move in definite orbits around the nucleus like planets circling the sun.
James Chadwick conducted an investigation involving radiation and discovered the presence of the neutron. According to the theory of wave mechanics, electrons do not move about an atom in a definite path. According to the modern atomic model, an atom has a small positively charged nucleus surrounded by a large region in which there is enough electron to make an atom neutral.
Rutherford's gold foil experiment | 30 August 1871 | Ernest Rutherford
1 January 2000
Rutherford's experiment involved firing a stream of tiny positively charged particles at a thin sheet of gold foil (2000 atoms thick). While most of the positive particles went through the sheet some also bounced back him which could only mean that the gold atoms in the sheet were mostly open space