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QUESTION

# What is atomic number of gold?

For Au, Z=79

What does this mean? It means that in the gold nucleus there are 79 protons, 79 positively charged, massive particles. If there were a different number then the element would NOT be gold, because the defines elemental indentity: Z=1, H; Z=2, He; ..........Z=78, Pt, Z=79, Au