Electronic configuration of the outer shell of the element Gd with atomic number 64 is

Q. Electronic configuration of the outer shell of the element Gd with atomic number 64 is

A.            4f4 5d5 6s1

B.            4f3 5d5 6s2

C.            4f5 5d4 6s1

D.            4f7 5d1 6s2

Answer: 4f7 5d1 6s2