Which elements have only one electron orbit or shell? A. hydrogen (H) and helium (He) B. helium (He) and lithium (Li) C. krypton
(Kr) and iron (Fe) D. hydrogen (H) and calcium (Ca)
1 answer:
2.1 Electrons, Protons, Neutrons, and Atoms
Hydrogen H 1
Helium He 2
Lithium Li 3
Beryllium Be 4
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