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What is the electronic configuration of Chlorine?

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Question: What is the electronic configuration of Chlorine?

Options:

  1. 1s2 2s2 2p6 3s2 3p5
  2. 1s2 2s2 2p6 3s2 3p4
  3. 1s2 2s2 2p6 3s2 3p6
  4. 1s2 2s2 2p6 3s2 3p3

Correct Answer: 1s2 2s2 2p6 3s2 3p5

Solution: 

Chlorine (Cl) has 17 electrons, so its configuration is 1s2 2s2 2p6 3s2 3p5.

What is the electronic configuration of Chlorine?

Practice Questions

Q1
What is the electronic configuration of Chlorine?
  1. 1s2 2s2 2p6 3s2 3p5
  2. 1s2 2s2 2p6 3s2 3p4
  3. 1s2 2s2 2p6 3s2 3p6
  4. 1s2 2s2 2p6 3s2 3p3

Questions & Step-by-Step Solutions

What is the electronic configuration of Chlorine?
  • Step 1: Identify the atomic number of Chlorine (Cl), which is 17. This means Chlorine has 17 electrons.
  • Step 2: Start filling the electron shells according to the order of energy levels.
  • Step 3: Fill the first shell (1s) with 2 electrons: 1s2.
  • Step 4: Fill the second shell (2s) with 2 electrons: 2s2.
  • Step 5: Fill the second shell's p subshell (2p) with 6 electrons: 2p6.
  • Step 6: Move to the third shell (3s) and fill it with 2 electrons: 3s2.
  • Step 7: Finally, fill the third shell's p subshell (3p) with 5 electrons: 3p5.
  • Step 8: Combine all the filled subshells to write the complete electronic configuration: 1s2 2s2 2p6 3s2 3p5.
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