form rows across the table based upon the number of energy levels in the atoms
Principle Quantum number
What labels each period?
form columns down the table based upon the number of valence electrons in the atoms
The numeric tendency of a valence electron to change
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
has 3 valence electrons with a valence of 3 EXCEPT boron which has a valence of 5
has 4 valence electrons with a valence of 4
has 5 valence electrons with a valence of 3
has 6 valence electrons with a valence of 2
has 7 valence electrons with a valence of 1
has 8 valence electrons with a valence of 0
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