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What is the electronic configuration of the element with atomic number 26?

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Question: What is the electronic configuration of the element with atomic number 26?

Options:

  1. [Ar] 4s2 3d6
  2. [Ar] 4s2 3d5
  3. [Kr] 5s2 4d6
  4. [Ar] 4s1 3d7

Correct Answer: [Ar] 4s2 3d6

Solution: 

The element with atomic number 26 is iron (Fe), and its electronic configuration is [Ar] 4s2 3d6.

What is the electronic configuration of the element with atomic number 26?

Practice Questions

Q1
What is the electronic configuration of the element with atomic number 26?
  1. [Ar] 4s2 3d6
  2. [Ar] 4s2 3d5
  3. [Kr] 5s2 4d6
  4. [Ar] 4s1 3d7

Questions & Step-by-Step Solutions

What is the electronic configuration of the element with atomic number 26?
Correct Answer: [Ar] 4s2 3d6
  • Step 1: Identify the atomic number. The atomic number 26 corresponds to the element iron (Fe).
  • Step 2: Understand that the electronic configuration shows how electrons are arranged in an atom.
  • Step 3: Recall the order of filling electron orbitals: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, etc.
  • Step 4: Fill the orbitals according to the Aufbau principle until you reach 26 electrons.
  • Step 5: The filling order for iron (26 electrons) is: 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d6.
  • Step 6: Combine the filled orbitals to write the electronic configuration: [Ar] 4s2 3d6.
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