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Atoms of elements that are in the same group have the same number of O protons O protons and neutrons O principle energy level O valence electrons
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3 votes
Atoms of elements that are in the same group have the same number of

O protons
O protons and neutrons
O principle energy level
O valence electrons

User Alex Kerr
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Atoms are grouped together by their number of valence electrons
User Loghorn
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