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umka21 [38]
3 years ago
5

How to find the valence electrons on a periodic table + energy levels?

Chemistry
1 answer:
Zigmanuir [339]3 years ago
3 0
The answer is elements in the first row (hydrogen and helium) will have outer electrons in the first energy level. Their principal quantum number is 1. Elements in the second row (lithium through neon) will have valence electrons in the second energy level with a principal quantum number of 2. I hope that helps.
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More about adolescence: brainly.com/question/13528489

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