What is the electron configuration of a chlorine atom?

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Question: What is the electron configuration of a chlorine atom?

Options:

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

Solution:

Chlorine has 17 electrons, and its electron configuration is 1s2 2s2 2p6 3s2 3p5.

What is the electron configuration of a chlorine atom?

What is the electron configuration of a chlorine atom?

Step 1: Identify the atomic number of chlorine, which is 17. This means a chlorine atom has 17 electrons.
Step 2: Start filling the electron shells according to the order of energy levels: 1s, 2s, 2p, 3s, and 3p.
Step 3: Fill the 1s shell first with 2 electrons. This gives us 1s2.
Step 4: Fill the 2s shell next with 2 electrons. Now we have 1s2 2s2.
Step 5: Fill the 2p shell with 6 electrons. Now we have 1s2 2s2 2p6.
Step 6: Fill the 3s shell with 2 electrons. Now we have 1s2 2s2 2p6 3s2.
Step 7: Finally, fill the 3p shell with 5 electrons. This gives us the complete electron configuration: 1s2 2s2 2p6 3s2 3p5.

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