What is the atomic number of Iron?

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Multiple Choice

What is the atomic number of Iron?

Atomic number is the count of protons in an atom’s nucleus and serves as the unique identifier for each element. Iron has twenty-six protons, so its atomic number is twenty-six. In a neutral atom, the number of electrons matches the number of protons, so iron also has twenty-six electrons. Different elements have different numbers of protons, which is why this specific count uniquely identifies iron. For context, iron has common isotopes, such as iron-56, where the mass number is made up of protons plus neutrons (twenty-six protons plus thirty neutrons), illustrating how mass relates to neutrons while the atomic number stays fixed at twenty-six.

Atomic number is the count of protons in an atom’s nucleus and serves as the unique identifier for each element. Iron has twenty-six protons, so its atomic number is twenty-six. In a neutral atom, the number of electrons matches the number of protons, so iron also has twenty-six electrons. Different elements have different numbers of protons, which is why this specific count uniquely identifies iron. For context, iron has common isotopes, such as iron-56, where the mass number is made up of protons plus neutrons (twenty-six protons plus thirty neutrons), illustrating how mass relates to neutrons while the atomic number stays fixed at twenty-six.

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