What is the principal quantum number of the outermost electron in chlorine?

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Question: What is the principal quantum number of the outermost electron in chlorine?

Options:

Correct Answer: 3

Solution:

Chlorine has an atomic number of 17, and its outermost electrons are in the n=3 shell.

What is the principal quantum number of the outermost electron in chlorine?

What is the principal quantum number of the outermost electron in chlorine?

Step 1: Find the atomic number of chlorine. Chlorine has an atomic number of 17.
Step 2: Determine the electron configuration of chlorine. The electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁵.
Step 3: Identify the outermost shell. The outermost electrons are in the 3rd shell (n=3).
Step 4: Conclude that the principal quantum number of the outermost electron in chlorine is 3.

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