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If the elements with principal quantum n...

If the elements with principal quantum number n`gt ` 4 did not exist in nature the number of possible element would be ________ .

A

60

B

32

C

4

D

64

Text Solution

Verified by Experts

The correct Answer is:
A
The maximum no. of electrons in a shell is 2`n^(2)`
For `" " n =1 ,` K- shell ,
no. of electrons =2
For n=2 , L-shell ,
no. of electrons = 8
For n = 3 , M- shell,
no. of electrons = 18
For n = 4 , N-shell ,
no. of electrons = 32
Thus the total number of electrons = 60 Hence the number of elements will be 60
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