Azimuthal Quantum Number, l = 0, 1, 2, 3…

Principal Quantum Number, n = 1, 2, 3, 4…

Niels Bohr was one the greatest physicist of the 20th century. He was honoured with the Nobel Prize in Physics in 1922 for his atomic theory.

Bohr's atomic theory was prosed by Neils Bohr in 1913. It was the first to inaugurate the quantum theory in the atom.

Rutherford's atomic model was a landmark, which explained the existence of the nucleus.

Rutherford's gold scattering experiment is an important event in the history of science because it led to the discovery of the nucleus.

The plum pudding is an atomic model formulated by J. J. Thomson. According to the model, the negative charge particles are embedded in the positive charge cloud in the atom.

Thomson's all three experiments are discussed. He studied magnetic and electric properties of cathode rays and determined the mass-to-charge ratio of the electron.

Mass concentration is a volumetric measure like molarity. It is the ratio of the mass of a solute to the volume of solution.

Molality is a concentration that tells how much a solute is present per kg of the solvent.