Enter the full electron configuration for S 2 − .

Question

What is the atomic symbol for the noble gas that also has this electron configuration?

atomic symbol:

Answer 1

Hello Ariel,

The Atomic number of Sulphur is 16. But since it is S2-, it means it has gained 2 more electrons and resembles Argon with an atomic number of 18.

So the electronic configuration of S2- will be:

1st inner shell=2 electrons,

2nd shell=8,

3rd shell=8, a total of 18 electrons.

The atomic symbol for Argon is Ar and is a noble gas with 8 valence electrons in the outer shell.

Hope I have clarified your question.

Thank you,

Geetha