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

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

Options:

Correct Answer: 3

Solution:

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

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

What is the principal quantum number of 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: Determine the electronic configuration of potassium. It is [Ar] 4s1.
Step 4: Look at the outermost electron in the electronic configuration, which is in the 4s subshell.
Step 5: Identify the principal quantum number, which corresponds to the energy level of the outermost electron. In this case, it is 4.

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