Question

An atom of the most common isotope of gold, 197au, has __________ protons, __________ neutrons, and __________ electrons.

Answer 1

79 protons, 118 neutrons, 79 electrons

Answer 2

Au-179 has 79 protons. This can be found by looking at a periodic table.
The 179 means that the neutrons + protons = 197

We know that it has 79 protons, that means that neutrons must be equal to 197 - 79 = 118 neutrons

Since this is a neutral atom, that means that the number of electrons is equal to the number of protons. Au-197 will have 79 electrons.

It has 79 protons, 118 neutrons, and 79 electrons.