The maximum number of electrons in an atom that can have \(n=3\) and \(m_s=+\frac12\) is
A. 3
B. 9
C. 6
D. 18
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Answer: B. 9
The \(n=3\) shell has \(n^2=9\) orbitals, and each holds one electron with \(m_s=+\frac12\).
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· 23 Oct 2026
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