MCAT Organic Chemistry Question 44: Answer and Explanation

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Question: 44

14. An electron is known to be in the n = 4 shell and the l = 2 subshell. How many possible combinations of quantum numbers could this electron have?

A. 1
B. 2
C. 5
D. 10

Correct Answer: D

Explanation:

An electron in the n = 4 shell and the l = 2 subshell can have five different values for m_l: –2, –1, 0, 1, or 2. In each of these orbitals, electrons can have positive or negative spin. Thus, there are 5 × 2 = 10 possible combinations of quantum numbers for this electron.

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