For how many elements in periodic table outermost electron is present in's' subshell?
(A) 12
(B) 13
(C) 14
(D) 10

How many element are present in the third period of the p-block elements ?

How are the group number and period number of an element in the periodic table determined from the electronic configuration of the element ?

How many squares are there in the given figure? (A) 10 (B) 13 (C) 12 (D) 14

How many elements are there in the 5^(th) period of modern periodic table ?

How many elements are present in i) Fifth period ii) Sixth period?