Question

For each main-group element, what is the relationship between it's group number and the number if valence electrons that the group members have?

Answer 1

Explanation:

The representative elements are in columns A1 - A7. In an 18 column table the map is as follows:

A1 = column 1, hydrogen + alkali metals have 1 valence

A2 = column 2, alkaline earth metals have 2 valence

A3 = column 13, Boron family have 3 valence

A4 = column 14, Carbon group have 4 valence

A5 = column 15, Nitrogen family have 5 valence

A6 = column 16, Oxygen column - chalcogens have 6 valence

A7 = column 17, Fluorine column - halogens have 7 valence

The group number of the representative elements = the number of valence electrons.