Question

How do valence electrons vary across the periodic table?

Answer 1

Valence electron varies according to the group the element is in.

Explanation:

For instance, hydrogen is in group 1. Hence, it has a valence electron of 1.

Carbon is in group 14. Hence, it has a valence electron of 4.

Xenon is in group 18. Hence, it has a valence electron of 8.

I am sure you see the pattern by now.