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Naturally occurring as it is a stable element. Synthetic means man made and it would be pointless to make oxygen when there is so much of it floating around in the air or in water even if it could be done.

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13y ago
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11y ago

oxygen-15 occurs naturally because it is air, it is transferred through our lungs daily.

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14y ago

it is natural

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11y ago

natural

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Q: Is oxygen 15 natural or synthetic?
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