Atomic StructureHard

Question

The electrons, identified by quantum numbers n and l, (i) n = 4, l = l (ii) n = 4, l = 0 (iii) n = 3, l = 2 and (iv) n = 3, l = 1 can be placed in order of increasing energy from the lowest to highest, as :

Options

A.(iv) < (ii) < ( iii) < (i)
B.(ii) < (iv) < ( i) < (iii)
C.(i) < (iii) < ( ii) < (iv)
D.(iii) < (i) < ( iv) < (ii)

Solution

Using (n + l)
Set :         (i)        (ii)         (iii)         (iv)
(n + l) :       5         4           5            4
Thus correct order of increasing energy is
         

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