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Careful chemical analysis showed that Earth is about 7 percent richer in oxygen-17 and oxygen-18, relative to oxygen-16, compared with the sun.
The nuclei of all atoms of oxygen, for instance, must contain eight protons, but the common oxygen-16 nucleus must contain eight protons and eight neutrons, the oxygen-17 nucleus eight protons and nine neutrons, and the oxygen-18 nucleus eight protons and ten neutrons.