Answer :

Final answer:

A gold atom has 118 neutrons.


Explanation:

The number of neutrons in a gold atom can be calculated by subtracting the atomic number from the mass number. The atomic number of gold is 79, which means it has 79 protons. The mass number of gold is given as 197. Therefore, the number of neutrons can be calculated as:

Neutrons = Mass number - Atomic number

= 197 - 79

= 118

So, a gold atom has 118 neutrons.


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