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The electrons identified by quantum numbers n and l :-
(a) n=4, l=1 (b) n=4, l=0 (c ) n=3, l=2 (d) n=3, l=1
Can be placed in order of increasing energy as
A. `n=4, l=1`
B. `n=4, l=0`
C. `n=3, l=2`
D. `n=3, l=1`

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Best answer
Correct Answer - 2
(a) `4p` (b) `4 s` (c) `3 d` (d) `3p`
Acc. To `(n+l)` rule, increasing order of energy `(d) lt (b) lt (c) lt (a)`

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