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Periods, Groups, Valence, and Valence Electrons

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Periods
form rows across the table based upon the number of energy levels in the atoms
Principle Quantum number
What labels each period?
Groups
form columns down the table based upon the number of valence electrons in the atoms
Valence
The numeric tendency of a valence electron to change
18 groups
How many groups are labeled with the group numbers?
Higher the reactivity
Lower the valence....
have 2 valence electrons with a V of 2
Groups 8, 9, 10, and 12
has 1 valence electron with a valence of 1
Group 11
has 3 valence electrons with a valence of 3 EXCEPT boron which has a valence of 5
Group 13
has 4 valence electrons with a valence of 4
Group 14
has 5 valence electrons with a valence of 3
Group 15
has 6 valence electrons with a valence of 2
Group 16
has 7 valence electrons with a valence of 1
Group 17
has 8 valence electrons with a valence of 0
Group 18