Structure of the Atom

Atoms consist of three fundamental subatomic

Atoms consist of three fundamental subatomic particles. Protons are positively charged particles found in the nucleus with a charge of +1 and mass of

J

J.J. Thomson proposed that atoms consist of a positively charged sphere with electrons embedded throughout it, like currants in a Christmas pudding or

Ernest Rutherford fired fast

Ernest Rutherford fired fast-moving alpha particles (helium ions with mass 4 u) at a thin gold foil. Most particles passed straight through, some were

Based on his scattering experiment

Based on his scattering experiment, Rutherford proposed that atoms have a small, positively charged nucleus at the center containing most of the atom'

Niels Bohr proposed that electrons occupy

Niels Bohr proposed that electrons occupy only certain special orbits called discrete orbits or energy levels (K, L, M, N shells or n = 1, 2, 3, 4...)