Answer :

The two closest isotopes for gold-197 are gold-196 and gold-198.

The atomic number of gold is 79, which means it has 79 protons. Gold-197 refers to the isotope of gold with a mass number of 197, indicating the total number of protons and neutrons in the nucleus.

The two closest isotopes to gold-197 are:

1. Gold-196: It has 79 protons and 117 neutrons (197 - 79 = 118).

2. Gold-198: It has 79 protons and 119 neutrons (197 - 79 = 118).

Therefore, the two closest isotopes to gold-197 are gold-196 and gold-198, with the number of neutrons being the only difference between them.

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