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What is the electronic configuration of a chlorine ion (Cl-)?

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Question: What is the electronic configuration of a chlorine ion (Cl-)?

Options:

  1. 1s2 2s2 2p6 3s2 3p5
  2. 1s2 2s2 2p6
  3. 1s2 2s2 2p6 3s2 3p6
  4. 1s2 2s2 2p6 3s2 3p4

Correct Answer: 1s2 2s2 2p6

Solution: 

Chlorine ion (Cl-) has gained an electron, resulting in the configuration 1s2 2s2 2p6.

What is the electronic configuration of a chlorine ion (Cl-)?

Practice Questions

Q1
What is the electronic configuration of a chlorine ion (Cl-)?
  1. 1s2 2s2 2p6 3s2 3p5
  2. 1s2 2s2 2p6
  3. 1s2 2s2 2p6 3s2 3p6
  4. 1s2 2s2 2p6 3s2 3p4

Questions & Step-by-Step Solutions

What is the electronic configuration of a chlorine ion (Cl-)?
Correct Answer: 1s2 2s2 2p6
  • Step 1: Understand that a chlorine atom has 17 electrons in its neutral state.
  • Step 2: Know that a chlorine ion (Cl-) has gained 1 extra electron, making the total 18 electrons.
  • Step 3: Write the electronic configuration for 17 electrons (neutral chlorine): 1s2 2s2 2p6 3s2 3p5.
  • Step 4: Add the extra electron to the configuration. The extra electron goes into the 3p orbital, making it 3p6.
  • Step 5: The final electronic configuration for the chlorine ion (Cl-) is 1s2 2s2 2p6 3s2 3p6.
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