2. H, Li, Be
Chemistry, 15.01.2021 07:40 carsengilbert
Which set of the below elements are in the same period.
1. Li, Be, C, O
2. H, Li, Be
3. F, CI, Br, I
4. H, He, Li, Be
Answers: 3
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Which set of the below elements are in the same period.
1. Li, Be, C, O
2. H, Li, Be
2. H, Li, Be
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