Question

Which of the following should be the possible sub-shells, for
n + ???? = 7 ?
(a) 7s, 6p, 5d, 4f (b) 4f, 5p, 6s, 4d
(c) 7s, 6p, 5d, 6d (d) 4s, 5d, 6p, 7s

Answer 1

The possible subshells for

n + ???? = 7 will be by n+l rule

1) Where value of l is maximum at l =n-1

And at l=n it is not defined.

2) given here is n+l= 7

So possible outcomes of it are

7+0=0 which will be 7s

6+1=7 which will be 6p

5+2=7 which will be 5d

4+3=7 which will be 4f

3+4=7 not possible

And so on

3) so option (a) is the right answer

Answer 2

The possible answer is 7s, 6p, 5d, 4f. This means option (A) is correct.

Explanation:

As per the question statement:

The possible sub shells for n + ???? = 7 will be by n+l rule which states that the orbital with lower n has lower energy.

The value of l is maximum at l = n - 1

Here it is given that n+l =  7

The possible outcomes are

• 7 + 0 = 0 which will be 7s
• 6 + 1 = 7 which will be 6p
• 5 + 2 = 7 which will be 5d
• 4 + 3 = 7 which will be 4f
• 3 + 4 =7 which is not possible

Thus the possible answer is 7s, 6p, 5d, 4f. This means option (A) is correct.

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