Q.

If in nature there may not be an element for which the  principal quantum number n > 4, then the total possible number of elements will be

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a

60

b

32

c

4

d

64

answer is A.

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Detailed Solution

For n = 1, maximum number of states = 2n2 = 2 and  for n = 2, 3, 4, maximum number of states would be 8, 18, 32 respectively, Hence number of possible elements =2+8+18+32=60
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