Question

. Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?

Answer 1

Answer:

Chlorine.

Explanation:

Chlorine is not a noble gas. It's one electron shy of a full octet, so unlike the noble gases, it's highly reactive.

Answer 2

Answer:

Chlorine ,sodium etc

Explanation:

noble noble gas are called inert gas because they have completed outer electron shells

and become stable. in an periodic table except noble gas all other element is Nobel Gas .

They are like alkali metal ,alkaline earth metal etc