Question

Which period contains two elements in periodic table ?
(A) 1
(B) 7
(C) 5
(D) 2​

Answer 1

Answer:

1 st period contains two elements name:- 1 hydrogen,2:- helium...

I think Ur doubt is clear now

Answer 2

Answer:

option A

Explanation:

The first period in the Periodic table contains  only two elements.

The elements present are Hydrogen(H) and Helium(He) respectively

Therefore, the correct option will be   (A)1

Hope it helps you:)

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