Identify 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 = 2, 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, the Br atom gains one electron to become Br-. The electron gained would be in a higher energy level than the ground state Br atom, so n=4 or higher. The electron gained would also have opposite spin to the electron in the Br atom's highest occupied orbital, so ms would be -1/2. 
The orbital shape (l) of the gained electron depends on the available orbitals in the Br atom. The Br atom has empty 4p orbitals, so the gained electron would likely be in a 4p orbital. Among the answer choices, only C has l=1, which corresponds to the shape of a 4p orbital.

Identify the Set of Four Quantum Numbers That Could Represent