What is the electronic configuration of the iron (Fe) atom?

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Question: What is the electronic configuration of the iron (Fe) atom?

Options:

Correct Answer: [Ar] 4s2 3d6

Solution:

Iron (Fe) has 26 electrons, and its electronic configuration is [Ar] 4s2 3d6.

What is the electronic configuration of the iron (Fe) atom?

What is the electronic configuration of the iron (Fe) atom?

Step 1: Understand that an atom's electronic configuration shows how its electrons are arranged.
Step 2: Know that iron (Fe) has an atomic number of 26, which means it has 26 electrons.
Step 3: Recognize that electrons fill energy levels in a specific order, starting from the lowest energy level.
Step 4: The first two electrons fill the 1s orbital: 1s2.
Step 5: The next two electrons fill the 2s orbital: 2s2.
Step 6: The next six electrons fill the 2p orbital: 2p6.
Step 7: The next two electrons fill the 3s orbital: 3s2.
Step 8: The next six electrons fill the 3p orbital: 3p6.
Step 9: The next two electrons fill the 4s orbital: 4s2.
Step 10: The remaining electrons fill the 3d orbital: 3d6.
Step 11: Combine all the filled orbitals to write the complete electronic configuration: [Ar] 4s2 3d6.

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