(i) What is the orbital angular momentum...

(i) What is the orbital angular momentum of a p-electron in `(h)/(2pi)` unit?
(ii) (a) Atomic number of two elements X and Y are 15 and 27 respectively. Write down the electronic configuration of `X^(3-) and Y^(3+)` ions-
(b) State two limitations of Bohr's theory of H-atom.

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