What is the atomic number of lead?

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Multiple Choice

What is the atomic number of lead?

The atomic number is the count of protons in the nucleus, and that number uniquely identifies the element. Lead has 82 protons, so its atomic number is 82. Isotopes can vary in neutrons and thus mass, but the number of protons—and the atomic number—stays the same. The other options correspond to different elements, not lead.

The atomic number is the count of protons in the nucleus, and that number uniquely identifies the element. Lead has 82 protons, so its atomic number is 82. Isotopes can vary in neutrons and thus mass, but the number of protons—and the atomic number—stays the same. The other options correspond to different elements, not lead.

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