La Rioja PAU Chemistry Practice Questions - La Rioja PAU Chemistry Examination (Química 2o Bachillerato Universidad De La Rioja 2026) Exam

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Which set of quantum numbers (n, l, m_l, m_s) correctly describes the highest-energy valence electron in a ground-state sodium atom (Na, Z = 11)?

n = 3, l = 0, m_l = 0, m_s = +1/2 n = 3, l = 1, m_l = 0, m_s = +1/2 n = 2, l = 1, m_l = +1, m_s = -1/2 n = 3, l = 2, m_l = 0, m_s = +1/2

Correct Answer:

n = 3, l = 0, m_l = 0, m_s = +1/2

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