Correct: Electrons are in shells, Protons and neutrons are in the nucleus, 2 electrons can go in the first shell, 8 electrons can go in the 2nd and 3rd shells, atoms in the same group have the same number of outer shell electrons, Incorrect: Electrons are in the nucleus, Protons and neutrons are in shells, 8 electrons can go in the first shell, 2 electrons can go in the 2nd and 3rd shells, atoms in different groups have the same number of outer shell electrons,

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