What is the value of the principal quantum number (n) for the outermost electron

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Question: What is the value of the principal quantum number (n) for the outermost electrons in a sodium atom?

Options:

Correct Answer: 3

Solution:

Sodium has an atomic number of 11, and its electron configuration is 1s² 2s² 2p⁶ 3s¹. The outermost electrons are in n=3.

What is the value of the principal quantum number (n) for the outermost electrons in a sodium atom?

What is the value of the principal quantum number (n) for the outermost electrons in a sodium atom?

Correct Answer: 3

Step 1: Identify the atomic number of sodium, which is 11.
Step 2: Write the electron configuration for sodium, which is 1s² 2s² 2p⁶ 3s¹.
Step 3: Look at the highest energy level in the electron configuration, which is 3s.
Step 4: Determine the principal quantum number (n) for the outermost electrons, which corresponds to the highest energy level, n=3.

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