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What is the electronic configuration of a neutral sodium atom?

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Question: What is the electronic configuration of a neutral sodium atom?

Options:

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

Correct Answer: 1s2 2s2 2p6 3s1

Solution: 

Sodium has 11 electrons, and its configuration is 1s2 2s2 2p6 3s1.

What is the electronic configuration of a neutral sodium atom?

Practice Questions

Q1
What is the electronic configuration of a neutral sodium atom?
  1. 1s2 2s2 2p6 3s1
  2. 1s2 2s2 2p6
  3. 1s2 2s2 2p5
  4. 1s2 2s2 2p6 3s2

Questions & Step-by-Step Solutions

What is the electronic configuration of a neutral sodium atom?
Correct Answer: 1s2 2s2 2p6 3s1
  • Step 1: Understand that a neutral sodium atom has 11 electrons because its atomic number is 11.
  • Step 2: Electrons are arranged in energy levels or shells around the nucleus of the atom.
  • Step 3: The first energy level can hold a maximum of 2 electrons. So, we fill this level first: 1s2.
  • Step 4: The second energy level can hold a maximum of 8 electrons. We fill this level next: 2s2 2p6.
  • Step 5: Now we have used 10 electrons (2 in the first level and 8 in the second level). We have 1 electron left.
  • Step 6: The third energy level starts with the 3s subshell, where we place the last electron: 3s1.
  • Step 7: Combine all the filled subshells to write the complete electronic configuration: 1s2 2s2 2p6 3s1.
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