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What element has 1 valence electrons and 4 energy levels?
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What element has 1 valence electrons and 4 energy levels?

User Eliasetm
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5 votes

Answer:

Hydrogen and Helium

Step-by-step explanation:

User 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:

User Toivo Henningsson
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