Question

What does the group number of A elements in the A/B numbering system)

tell about valence electrons?

A. The A group number tells which period the valence electrons are
in
B. The A group number tells how much mass the elements have.
C. All elements in the same A group will have the same number of
valence electrons.
D. All elements in the A group will have the same valence electrons
as the B group.

Answer 1

All elements in the same A group will have the same number of

valence electrons.

Step-by-step explanation:

Group A has 1 valence electrons.