What is the value of the principal quantum number for the outermost electrons in

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Question: What is the value of the principal quantum number for the outermost electrons in potassium (K)?

Options:

Correct Answer: 4

Solution:

Potassium has an atomic number of 19, and its outermost electrons are in the n=4 shell.

What is the value of the principal quantum number for the outermost electrons in potassium (K)?

What is the value of the principal quantum number for the outermost electrons in potassium (K)?

Step 1: Identify the atomic number of potassium (K). The atomic number is 19.
Step 2: Understand that the atomic number tells us the number of electrons in a neutral atom. Potassium has 19 electrons.
Step 3: Determine the electron configuration of potassium. The configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹.
Step 4: Look at the highest energy level (shell) in the electron configuration. The highest number is 4 in the 4s¹.
Step 5: Conclude that the value of the principal quantum number for the outermost electrons in potassium is n=4.

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