What element has 1 valence electrons and 4 energy levels?

asked Mar 16, 2022 155k views

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5 votes

Answer:

Hydrogen and Helium

Step-by-step explanation:

Xke answered Mar 17, 2022

by Xke

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5 votes

Answer:

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

Step-by-step explanation:

Toivo Henningsson answered Mar 20, 2022

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