Answer sheet - River Dell Middle School

3. a. they are the same number IE: group 1 and # of valence electrons -1 . Groups 13 is also referred to as 3A. Group 14 4A. Group 15 5A. Group 16 6A. Group 17 7A. Group 18 8A. they are the same number IE: period 3 has valence electrons on energy level 3. 4.. group 16 ( 6A) - period 3 - p block. 5. ................
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