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Chemistry, 19.02.2021 19:40 gizmokris

Which of the following Noble Gases has only 2 valence electrons because it only has 1 energy level? Helium (He)
Neon (Ne)
Argon (Ar)
Krypton (Kr)

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Which of the following Noble Gases has only 2 valence electrons because it only has 1 energy level?...
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