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Introduction to d and f Block Elements

What is atomi...

Question

What is atomic number of gold?

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Solution

For, $A u, Z = 79$
Explanation:
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 atomic number defines elemental indentity: $Z = 1, H; Z = 2,$ He;......... $Z = 78$ , Pt, $Z = 79, A u .$

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