Multiple choice Which of the following matches of ‘element: electronic configuration’ is correct? Ce: [Xe] 4f1 5d1 6s2 Nd: [Xe] 4f3 5d1 6s2 Sm: [Xe] 4f5 5d1 6s2 Eu: [Xe] 4f6 5d1 6s2 Gd: [Xe] 4f7 5d1 6s2 Reveal answer Fill a bubble to check yourself E Correct answer Explanation Correct answer. Electronic configuration of gadolinium (64Gd) is [Xe] 4f7 5d1 6s2.