What is a atomic number a measure of?

What is a atomic number a measure of?
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Answer :

The atomic number is the number of protons in an atom's nucleus,so we can tell right away that an atom of Mercury contains 80protons. The mass number (201) is the total number of protons andneutrons. So, there must be 201 - 80 = 121 neutrons.
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Name the devices used to measure very small distances such as atomic size.

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Last Answer : Name the devices used to measure very small distances such as atomic size.