Question

In long form, shortest period is____________.

• A. first
• B. second
• C. third
• D. zero

Answer 1

Answer: (A)

first

In the long form of periodic table, the first period has $2$ elements, second and third have $8$ elements; fourth and fifth have $18$ elements and sixth period has $32$ elements with seventh period being incomplete. Thus the shortest among these is first period. Hence correct answer is first period.