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What is the electronic configuration of Iron?

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Question: What is the electronic configuration of Iron?

Options:

  1. [Ar] 4s2 3d6
  2. [Ar] 4s2 3d8
  3. [Ar] 4s2 3d5
  4. [Ar] 4s2 3d7

Correct Answer: [Ar] 4s2 3d6

Solution: 

Iron (Fe) has the configuration [Ar] 4s2 3d6.

What is the electronic configuration of Iron?

Practice Questions

Q1
What is the electronic configuration of Iron?
  1. [Ar] 4s2 3d6
  2. [Ar] 4s2 3d8
  3. [Ar] 4s2 3d5
  4. [Ar] 4s2 3d7

Questions & Step-by-Step Solutions

What is the electronic configuration of Iron?
  • Step 1: Identify the atomic number of Iron (Fe), which is 26.
  • Step 2: Understand that the electronic configuration shows how electrons are arranged in an atom.
  • Step 3: Start filling the electron shells according to the Aufbau principle, which states that electrons fill lower energy levels first.
  • Step 4: Fill the 1s orbital with 2 electrons: 1s2.
  • Step 5: Fill the 2s orbital with 2 electrons: 2s2.
  • Step 6: Fill the 2p orbitals with 6 electrons: 2p6.
  • Step 7: Fill the 3s orbital with 2 electrons: 3s2.
  • Step 8: Fill the 3p orbitals with 6 electrons: 3p6.
  • Step 9: Move to the 4s orbital and fill it with 2 electrons: 4s2.
  • Step 10: Finally, fill the 3d orbitals with 6 electrons: 3d6.
  • Step 11: Combine all the filled orbitals to write the complete electronic configuration: [Ar] 4s2 3d6.
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