This video explains quantum numbers.
INTRODUCTION : The Bohr model was a one dimensional model that used one quantum number to describe the distribution of electrons in an atom. He used only one quantum number (n) to describe the size of the orbit.
Schrodinger's model allowed the electron to occupy three dimensional space. It therefore required three coordinates, or three quantum numbers, to describe the orbitals in which electrons can be found. These quantum numbers describe the size, shape, position, orientation and energy of electron in space of the orbitals in an atom.
Every electron in an atom is characterized by a set of 4 quantum numbers. They are

1. Principal Quantum number (n)
2. Azimuthal quantum number (l)
3. Magnetic quantum number (m)
4. Spin quantum number (s)

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ลิงค์ : http://youtu.be/XTzoX3Mmxvg

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