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Atomic weight is neutrons plus protons. If the atomic weight is 197, we subtract the number of protons which we know is 79 because that's what makes it gold, we get 118.

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11y ago
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13y ago

From the chart on the related link: 197Au is the most common, and should be pretty close to 100%, since the longest half-life of any of the others is 186 days.

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11y ago

The isotope gold-197 has 118 neutrons.

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Q: How many neutrons does the the common isotope of gold have?
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