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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##
