The electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. read more
Element 64 Gadolinium has an electronic configuration of [Xe] 4f7 5d1 6s2. It is a Lanthanide. I am guessing you are wondering about the 4f7 rather than 4f8 as its position in the table might suggest. read more