To clarify the relationship between nitrogen and oxygen in the periodic table: both elements are located in the same period (period 2), but they have different atomic numbers.
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Nitrogen has 7 electrons (atomic number 7), while oxygen has 8 electrons (atomic number 8). Therefore, they do not have the same number of electrons.
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Both elements have their valence electrons in the same energy level (the second energy level), which means this statement is true.
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Nitrogen has 5 valence electrons, and oxygen has 6 valence electrons, meaning they do not have the same number of valence electrons.
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Since both are in period 2, they do not have valence electrons in different energy levels.
Thus, the correct statement is: They have valence electrons in the same energy level.