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Which of the following molecular orbitals is filled first according to the Aufba

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Question: Which of the following molecular orbitals is filled first according to the Aufbau principle?

Options:

  1. σ1s
  2. σ*1s
  3. π2p
  4. σ2p

Correct Answer: σ1s

Solution: 

According to the Aufbau principle, the σ1s molecular orbital is filled first as it has the lowest energy.

Which of the following molecular orbitals is filled first according to the Aufba

Practice Questions

Q1
Which of the following molecular orbitals is filled first according to the Aufbau principle?
  1. σ1s
  2. σ*1s
  3. π2p
  4. σ2p

Questions & Step-by-Step Solutions

Which of the following molecular orbitals is filled first according to the Aufbau principle?
  • Step 1: Understand the Aufbau principle, which states that electrons fill the lowest energy orbitals first.
  • Step 2: Identify the molecular orbitals available for filling. In this case, we have the σ1s molecular orbital.
  • Step 3: Determine the energy levels of the molecular orbitals. The σ1s orbital has the lowest energy.
  • Step 4: Conclude that since the σ1s orbital has the lowest energy, it is filled first according to the Aufbau principle.
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