What is the principal quantum number for the outermost electrons in a sodium ato

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Question: What is the principal quantum number for the outermost electrons in a sodium atom?

Options:

Correct Answer: 3

Solution:

Sodium has an electron configuration of 1s2 2s2 2p6 3s1, so the principal quantum number is 3.

What is the principal quantum number for the outermost electrons in a sodium atom?

What is the principal quantum number for the outermost electrons in a sodium atom?

Step 1: Understand that the principal quantum number indicates the energy level of an electron in an atom.
Step 2: Look at the electron configuration of sodium, which is 1s2 2s2 2p6 3s1.
Step 3: Identify the outermost electrons in the electron configuration. In sodium, the outermost electron is in the 3s orbital.
Step 4: Determine the principal quantum number for the outermost electron. The number before the 's' in '3s' is 3.
Step 5: Conclude that the principal quantum number for the outermost electrons in a sodium atom is 3.

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