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
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
- [IIT 1983]
- A
$60$
- B
$32$
- C
$4$
- D
$64$
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