What is the atomic number of lead?

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Multiple Choice

What is the atomic number of lead?

Explanation:
Atomic number equals the number of protons in an atom’s nucleus, and it uniquely identifies the element. Lead has 82 protons, so its atomic number is 82. The other numbers correspond to different elements (80 is mercury, 74 is tungsten, 92 is uranium). Mass number, on the other hand, is protons plus neutrons and varies with isotopes, while the atomic number remains fixed for an element. So the atomic number of lead is 82.

Atomic number equals the number of protons in an atom’s nucleus, and it uniquely identifies the element. Lead has 82 protons, so its atomic number is 82. The other numbers correspond to different elements (80 is mercury, 74 is tungsten, 92 is uranium). Mass number, on the other hand, is protons plus neutrons and varies with isotopes, while the atomic number remains fixed for an element. So the atomic number of lead is 82.

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