The number of protons in the nucleus of an atom is called the

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Multiple Choice

The number of protons in the nucleus of an atom is called the

Explanation:
The number of protons in the nucleus identifies the element and its place in the periodic table. This count is called the atomic number, usually denoted Z. It uniquely marks what element you have—changing the number of protons changes the identity of the atom. By contrast, the mass number is the sum of protons and neutrons, atomic mass unit is just a mass unit, and a nuclide refers to a specific nucleus with a given number of protons and neutrons, not solely the proton count. So the term that matches the description is the atomic number.

The number of protons in the nucleus identifies the element and its place in the periodic table. This count is called the atomic number, usually denoted Z. It uniquely marks what element you have—changing the number of protons changes the identity of the atom. By contrast, the mass number is the sum of protons and neutrons, atomic mass unit is just a mass unit, and a nuclide refers to a specific nucleus with a given number of protons and neutrons, not solely the proton count. So the term that matches the description is the atomic number.

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