Question

Which of the following period is the shortest one?

(a) 1

(b) 3

(c) 2

(d) 4

The question was asked during an internship interview.

My doubt is from Modern Periodic Law and the Present Form of the Periodic Table in portion Classification of Elements and Periodicity in Properties of Chemistry – Class 11

Answer 1

Right option is (a) 1

For explanation I would say: The first period is known as the shortest period among the seven periods of the periodic table this is because it contains only two elements; one of the two elements is hydrogen which belongs to alkali metal group and the other is the Helium which is a noble gas.