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SashulF [63]
3 years ago
12

What element has 4 energy levels and 1 valence electron ​

Chemistry
1 answer:
ryzh [129]3 years ago
3 0

Answer: Hydrogen and helium, both in the first period, have their valence electrons in the principal energy level n=1.

Hope this helps.......... Stay safe and have a Merry Christmas!!!!!!!!!! :D

Explanation:

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