For Group 13–17 elements in the third row of the periodic table
and beyond, the octet rule is often not obeyed. A friend
of yours says this is because these heavier elements are more
likely to make double or triple bonds. Another friend of
yours says that this is because the heavier elements are larger
and can make bonds to more than four atoms at a time.
Which friend is more correct?
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Master Octet Rule with a bite sized video explanation from Jules Bruno