Answer :
Final answer:
A neutral atom of gold has 118 neutrons, derived from subtracting the atomic number (79) from the mass number (197).
Explanation:
In a neutral atom of gold, there are 118 neutrons. Gold has an atomic number of 79, which means it has 79 protons and, if the atom is neutral, it will also have 79 electrons. The most common isotope of gold has a mass number of 197. The mass number is the sum of protons and neutrons in an atom's nucleus. Therefore, to find the number of neutrons in gold, you can subtract the atomic number from the mass number: 197 – 79 = 118 neutrons.
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