The number that determines the identity of an element is its what?

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Multiple Choice

The number that determines the identity of an element is its what?

Explanation:
The number of protons in the nucleus defines which element it is. This count, called the atomic number, is unique to each element and determines its identity and position in the periodic table. If you change the number of protons, you’d get a different element. The mass number (protons plus neutrons) varies with isotopes and thus does not uniquely identify the element, and neutron count alone isn’t fixed to a single element. Therefore, the atomic number is the identifier.

The number of protons in the nucleus defines which element it is. This count, called the atomic number, is unique to each element and determines its identity and position in the periodic table. If you change the number of protons, you’d get a different element. The mass number (protons plus neutrons) varies with isotopes and thus does not uniquely identify the element, and neutron count alone isn’t fixed to a single element. Therefore, the atomic number is the identifier.

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