What is the electron configuration of a chlorine atom (atomic number 17)? (2020)

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Question: What is the electron configuration of a chlorine atom (atomic number 17)? (2020)

Options:

Correct Answer: 1s² 2s² 2p⁶ 3s² 3p⁵

Exam Year: 2020

Solution:

The electron configuration of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵, filling up to the 3p subshell.

What is the electron configuration of a chlorine atom (atomic number 17)? (2020)

What is the electron configuration of a chlorine atom (atomic number 17)? (2020)

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 with electrons, following the order of energy levels: 1s, 2s, 2p, 3s, and 3p.
Step 3: Fill the 1s subshell first with 2 electrons. Now we have 2 electrons.
Step 4: Fill the 2s subshell with 2 electrons. Now we have 4 electrons.
Step 5: Fill the 2p subshell with 6 electrons. Now we have 10 electrons.
Step 6: Fill the 3s subshell with 2 electrons. Now we have 12 electrons.
Step 7: Fill the 3p subshell with 5 electrons. Now we have 17 electrons, which is the total number of electrons in a chlorine atom.
Step 8: Write the electron configuration by combining all the filled subshells: 1s² 2s² 2p⁶ 3s² 3p⁵.

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