Question

What are quantum number explain any two of them in detail?

Answer 1

Quantum numbers are the numbers which define the location of electrons in the orbitals around the nucleus of an atom.

There are four quantum numbers, viz,

Principal quantum number (n) : It defines the main shell to which an electron belongs. The values of n =1,2,3,4,........

Azimuthal quantum number () : It tells us the number of subshells present in the main shell and the orbital to which an electron belongs. Its value is equal to 0 to (n-1).

Magnetic quantum number (m) : It informs the level of degeneracy of the orbitals. Its value is equal to -,0,+.

Spin quatum number (s) : It tells us whether the electron in an orbital is spinning in upward direction or downward direction. s has two values +1/2 for upward spin and -1/2 for downward spin.

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