What is the electron configuration of the ion Fe3+?

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Question: What is the electron configuration of the ion Fe3+?

Options:

Correct Answer: [Ar] 3d5

Solution:

Iron (Fe) has an atomic number of 26, and the electron configuration for Fe3+ is [Ar] 3d5 after losing 3 electrons.

What is the electron configuration of the ion Fe3+?

What is the electron configuration of the ion Fe3+?

Step 1: Identify the atomic number of iron (Fe), which is 26.
Step 2: Write the electron configuration for a neutral iron atom (Fe). It is 1s2 2s2 2p6 3s2 3p6 4s2 3d6.
Step 3: Determine that Fe3+ means the iron atom has lost 3 electrons.
Step 4: Remove 2 electrons from the 4s subshell and 1 electron from the 3d subshell.
Step 5: The remaining electrons after losing 3 are: 1s2 2s2 2p6 3s2 3p6 3d5.
Step 6: Write the simplified electron configuration using the nearest noble gas (argon, Ar) as a reference: [Ar] 3d5.

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