What is the atomic number of Oxygen?

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Multiple Choice

What is the atomic number of Oxygen?

Atomic number is the number of protons in the nucleus, and that count uniquely identifies the element. Oxygen has eight protons, so its atomic number is eight. In a neutral atom, the number of electrons matches the proton count, so oxygen would also have eight electrons. The other numbers correspond to different elements with different proton counts, so they would not describe oxygen.

Atomic number is the number of protons in the nucleus, and that count uniquely identifies the element. Oxygen has eight protons, so its atomic number is eight. In a neutral atom, the number of electrons matches the proton count, so oxygen would also have eight electrons. The other numbers correspond to different elements with different proton counts, so they would not describe oxygen.

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