What is the principal quantum number for the outermost electron in potassium (K)

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

Options:

Correct Answer: 4

Solution:

Potassium has an electron configuration of [Ar] 4s1, so the principal quantum number for the outermost electron is 4.

What is the principal quantum number for the outermost electron in potassium (K)?

What is the principal quantum number for the outermost electron in potassium (K)?

Step 1: Identify the element in question, which is potassium (K).
Step 2: Find the atomic number of potassium, which is 19.
Step 3: Write the electron configuration for potassium. It is [Ar] 4s1.
Step 4: Look at the last part of the electron configuration, which is '4s1'.
Step 5: The number before the 's' indicates the principal quantum number. Here, it is 4.
Step 6: Conclude that the principal quantum number for the outermost electron in potassium is 4.

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