What is the principal quantum number for the outermost electrons in sodium (Na)?

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Question: What is the principal quantum number for the outermost electrons in sodium (Na)? (2023) 2023

Options:

Correct Answer: 3

Exam Year: 2023

Solution:

Sodium has the electronic configuration of 1s² 2s² 2p⁶ 3s¹, so the principal quantum number for the outermost electrons is 3.

What is the principal quantum number for the outermost electrons in sodium (Na)? (2023) 2023

What is the principal quantum number for the outermost electrons in sodium (Na)? (2023) 2023

Step 1: Understand that the principal quantum number (n) indicates the energy level of an electron in an atom.
Step 2: Look at the electronic configuration of sodium (Na), which is 1s² 2s² 2p⁶ 3s¹.
Step 3: Identify the outermost electrons in the electronic configuration. The outermost electrons are in the highest energy level.
Step 4: In the configuration 1s² 2s² 2p⁶ 3s¹, the highest energy level is 3, which corresponds to the 3s¹ electron.
Step 5: Conclude that the principal quantum number for the outermost electrons in sodium is 3.

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