Which subshell for chlorine contains the valence electrons?

1s, 2s, 2p, 3s, or 3p

and explain your reasoning please!

3s + 3p.

Imagine them as “levels”.

Valence here would mean almost “outside”.

so, in this order:

1s;

2s; 2p;

3s; 3p

AND, even if we have, let’s say, iodine:

1s; 2s; 2p; 3s; 3p; 4s; 3d; 4p; 5s; 4d; 5p;

Our valence shell is 5 – or “O”.

So, 5s AND 5p contain the valence electrons.

Note that the 4d DOESN’T contain any valence electrons.

Basically just consider the ones with the highest “numbers”.

Got it?
The atomic No. of chlorine is 17. Hence the electronic configuration is: 1s2, 2s2, 2p6,3s2,3p5. Therefore the valence electron is in the 3p orbital.
Valence electrons are the s and p of the outer most energy level.

For chlorine it would be 3s2, 3p5 total of 7 valence electrons.
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