1.

Total number of electrons in any energy level is-(Α) Σ2(21 + 1) (B) Σ2(2/+1) (c)Σ2(21+1)(D)Σ2(21 +1)-0

Answer»

option d is correct

see while calculating the value of l we go from 0 to n-1 and no. of orbitals in an subshell is given by(2l+1). and we know each orbital has 2 electons so 2(2l+1) and putting value of l between 0 to n-1

For a certain Value of n, L is always from 0 to n-1

and for each l , the number of electrons = 2(2l+1)

so, total is summation of 2(2l+1) for all L

option D



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