The Periodic Table: Patterns & Trends
Slide 9 of 12
Group
The number of electrons in the outer-most shell is referred to as the valence electrons.
In the periodic table, the number of valence electrons in the atom of an element determines the group it belongs to.
Group Number
1       2                 3       4       5       6       7       8
Number of Valence  elecrons
1
1
1
1
1
1
2
2
2
2
2
2
Fill in the rest.