The number of protons in one atom of an element is called its?

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Multiple Choice

The number of protons in one atom of an element is called its?

Explanation:
The number of protons in an atom defines its identity as an element. That quantity is the atomic number, usually denoted Z. It uniquely identifies the element and determines its place in the periodic table. The mass number, A, is the sum of protons and neutrons and can vary between isotopes. The electron count equals the number of electrons (equal to Z in a neutral atom but not in ions). The neutron count is A minus Z. So the term for the number of protons is the atomic number.

The number of protons in an atom defines its identity as an element. That quantity is the atomic number, usually denoted Z. It uniquely identifies the element and determines its place in the periodic table. The mass number, A, is the sum of protons and neutrons and can vary between isotopes. The electron count equals the number of electrons (equal to Z in a neutral atom but not in ions). The neutron count is A minus Z. So the term for the number of protons is the atomic number.

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