Question

Name the element in which duplet is complete.

Answer 1

The element in which duplet is complete should have its atomic number  value as 2. because 1s²

∴HELIUM

Or if you consider 1s², then you will  also get H₂

But generally we will consider duplet as HELIUM

But since you are asking element...

∴FINAL ANSWER : HELIUM(He)

I HOPE IT HELPS...!!!

Answer 2

hilium and hydrogen

Hope it helps u.