Question

How does the periodic table indicate the number of valence electrons an

element has?
A. By the group number of the B columns
B. By the group number of the A columns
C. By the row number
D. By the period number

Answer 1

B. By the group number of the A columns

Step-by-step explanation:

Valence electrons which is a term that describes the number of electrons in the highest occupied energy level for an element helps to categories the elements into groups.

Hence, based on Chemical Abstracts Service, CAS grouping, it is shown or concluded that the periodic table indicate the number of valence electrons an element has by the group number of the A columns