Ion X3+ memiliki konfigurasi elektron 1s2 2s2 2p6 3s2 3p6 3d5. Harga bilangan kuantum elektron terluar atom X adalah ....
n = 3, l = 2, m = +2, s = +1/2
n = 3, l = 2, m = +2, s = -1/2
n = 3, l = 1, m = +1, s = +1/2
n = 4, l = 1, m = -1, s = +1/2
n = 4, l = 0, m = 0, s = -1/2