Explain qno.51.ans(3):

51. If in periodic table 10th periods are considered then number of subshell present in 9th period will be. 
(1) 6                  (2) 7
(3) 5                  (4) 8

The solution is as follows:

1. The correct option is (3) 5.

2. This is because, there are only 5 subshell possible,namely:

              s,p,d,f and g.

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