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What is the electron configuration of oxygen (O)?

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Question: What is the electron configuration of oxygen (O)?

Options:

  1. 1s2 2s2 2p4
  2. 1s2 2s2 2p6
  3. 1s2 2s1 2p5
  4. 1s2 2s2 2p3

Correct Answer: 1s2 2s2 2p4

Solution:

The electron configuration of oxygen (atomic number 8) is 1s2 2s2 2p4.

What is the electron configuration of oxygen (O)?

Practice Questions

Q1
What is the electron configuration of oxygen (O)?
  1. 1s2 2s2 2p4
  2. 1s2 2s2 2p6
  3. 1s2 2s1 2p5
  4. 1s2 2s2 2p3

Questions & Step-by-Step Solutions

What is the electron configuration of oxygen (O)?
  • Step 1: Identify the atomic number of oxygen, which is 8. This means oxygen has 8 electrons.
  • Step 2: Electrons fill energy levels starting from the lowest. The first energy level can hold up to 2 electrons.
  • Step 3: Place 2 electrons in the first energy level (1s), so we write 1s2.
  • Step 4: Move to the second energy level, which can hold up to 8 electrons. The second level has two sub-levels: 2s and 2p.
  • Step 5: Place 2 electrons in the 2s sub-level, so we write 2s2.
  • Step 6: Now we have used 4 electrons (2 in 1s and 2 in 2s). We have 4 electrons left to place in the 2p sub-level.
  • Step 7: Place 4 electrons in the 2p sub-level, so we write 2p4.
  • Step 8: Combine all the parts together to get the full electron configuration: 1s2 2s2 2p4.
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