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# The electrons identified by quantum numbers

Question:

The electrons identified by quantum numbers $\mathrm{n}$ and $\ell$ :-

(a) $\mathrm{n}=4, \ell=1$

(b) $\mathrm{n}=4, \ell=0$

(c) $\mathrm{n}=3, \ell=2$

(d) $\mathrm{n}=3, \ell=1$

Can be placed in order of increasing energy as

1. $(\mathrm{a})<(\mathrm{c})<(\mathrm{b})<(\mathrm{d})$

2. $(\mathrm{c})<(\mathrm{d})<(\mathrm{b})<(\mathrm{a})$

3. $(\mathrm{d})<(\mathrm{b})<(\mathrm{c})<(\mathrm{a})$

4. $(b)<(\mathrm{d})<(\mathrm{a})<$ (c)

Correct Option: , 3

Solution: