(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.

Explanation

(i) The orbital angular momentum in `(h)/(2pi)` unit is given by `sqrt(l(l+1))`, where l=azimuthal quantum number.
For p-orbital, l=1.
`therefore`The orbital angular momentum of p-orbital in `(h)/(2pi)` unit
`=sqrt(l(l+1))=sqrt(1(1+1))=sqrt(2)`.
(ii) (1) `""_(15)X^(3-):1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)`
`""_(27)Y^(3+):1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(6)`
(b) N/A