How many protons, neutrons, and electrons are in an atom of ¹⁹⁷Au, the most common isotope of gold?

Name: How many protons, neutrons, and electrons are in an atom of 197 Au, the most common isotope of gold?
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Question

Quizplus · Accepted Answer

Gold (Au) has an atomic number of 79, which means it has 79 protons and, in a neutral atom, 79 electrons. The most common isotope of gold has a mass number of 197, which is the sum of protons and neutrons. Therefore, it has 197 - 79 = 118 neutrons.

How Many Protons, Neutrons, and Electrons Are in an Atom