Posted by Sara on Tuesday, April 13, 2010 at 11:05pm.
Group 1 has 1 electron in the outer shell.
Group 2 has 2 electrons in the outer shell.
Group 3 has 3 electrons in the outer shellS.(includes 3d and 4s)
Group 4 has electrons in the outer shellS (includes 3d and 4s).
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