Question

What is the group of elements with the same number of valence electrons?

Answer 1

Elements in the same group number share the same number of valence electrons

Explanation:

This is one of the things you can tell from looking at a periodic table. For example, on the leftmost side (group1), each element in that group has 1 valence electron:
Li: 2,1
Na: 2,8,1
K: 2,8,8,1 etc