Question

Name the element that hasduplet structure and Name the lightest alkali metal

Answer 1

Explanation:

There are two elements which follow the duplet rule. Hydrogen and Helium. Both these elements have 1s orbital. They can accomodate 2 electrons.Lithium is the lightest metallic element.

Answer 2

Answer:

Both these elements have 1s orbital. They can accommodate 2 electrons. (ii) Lithium (Li) is the lightest metallic element with atomic number 3.