Which part of the atom defines the element's identity?

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Multiple Choice

Which part of the atom defines the element's identity?

Explanation:
Protons in the nucleus define the element’s identity. The number of protons, called the atomic number, is unique to each element (for example, hydrogen has 1, carbon has 6, iron has 26). Neutrons can vary to form different isotopes of the same element, but that doesn’t change the element itself. Electrons can change when atoms gain or lose electrons (ions), which affects charge and reactivity but not which element it is. So, the proton count is what sets the element apart.

Protons in the nucleus define the element’s identity. The number of protons, called the atomic number, is unique to each element (for example, hydrogen has 1, carbon has 6, iron has 26). Neutrons can vary to form different isotopes of the same element, but that doesn’t change the element itself. Electrons can change when atoms gain or lose electrons (ions), which affects charge and reactivity but not which element it is. So, the proton count is what sets the element apart.

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