Give the set of four quantum numbers that could represent the electron gained to form the Br ION from the Br atom. A) n = 4, l = 1, m_l = 1, m_s = + B) n = 4, l = 0, m_l = 1, m_s = - C) n = 4, l = 1, m_l = 1, m_s = - D) n = 3, l = 2, m_l = -2, m_s = - E) n = 5, l = 1, m_l = -1, m_s = -

Question

Quizplus · Accepted Answer

To form the Br ion, Br^-, we add one electron to the Br atom. The electron has to occupy an orbital with lower energy, which is 4s, rather than 3d. Therefore, the configuration of Br^- should be [Ar] 4s^2 3d^10. The last electron added should have opposite spin to one of the electrons in the 4s orbital. This leads to the following set of quantum numbers for the added electron: n = 4, l = 1, m_l = 1, m_s = -1/2. Choice C is the only set of quantum numbers that matches these requirements.

Give the Set of Four Quantum Numbers That Could Represent