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Iron's atomic number is 26. Thus it has 26 protons and 26 electrons. The electronic configuration for the first 26 electrons, and so therefore iron, is Fe 1s2 2s2 2p6 3s2 3p6 4s2 3d6.

The shorthand electron configuration is Fe [Ar] 4s2 3d6.

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Q: What is the electron configuration of iron?
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What is the electron configuration of atomic number 26?

The electron configuration of iron, atomic number 26, is [Ar]3d64s2. The expanded electron configuration is 1s22s22p63s23p63d64s2.


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The electron configuration of iron is [Ar]3d64s2. The electron shells contain 2, 8, 14 and 2 electrons.


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Iron has the electron configuration [Ar]3d64s2.


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The complete electron configuration for the chromium(III) ion is 1s22s22p63s23p64s03d3.


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