Democritus, According to him the world is made up of tiny indivisible particles called atomos, John Dalton, He was the one to proposed the solid sphere model of an atom.-, JJ Thomson, He was the one to discover the electron., Ernest Rutherford, His discovery of the nucleus led to a new model which he called the nuclear model of the atom, Niels Bohr, He added the concept of orbits., Energy levels, Orbits are also known as ______, Principal Quantum Number, It is also known as the shell., Azimuthal Quantum Number, It is also known as the subshell, Magnetic Quantum Number, It is the number of orbitals in a subshells, Electron Spin Quantum Number, It indicates the spin of the electron or the direction at which it revolves around the nucleus

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