What does an elements column number tell you about the atomic structure?

1 Answer
anor277
Jul 2, 2018

Well, the Group number, #1-18# gives the NUMBER of valence electrons....

Explanation:

And #"Group Number "-=" column number"#

For the second short Period, #Li# to #Ar#...the Group number tells you the number of valence electrons, we got #Li, Z=3#, i.e. #"Group 1"#, we got ONE VALENCE electron....

we got #F, Z=9#, i.e. #"Group VII"#, we got SEVEN VALENCE electrons....

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