Question

How do you use the periodic table to recall the ionic charge of an alkali metal, an alkaline earth metal, or aluminum?

A. The positive charge is the group number.
B. The negative charge is the group number.
C. The positive charge is the period number.
D. The negative charge is the period number.

Answer 1

The answer is (A), the positive charge is the group number

Alkali metals are 1+

Alkaline Earth metals are 2+

Aluminum is in group 3 so the charge is 3+