JEE Main 202227 Jun, Evening shiftChemistryEasyd- and f-Block Elements158× since 2002
The 'f' orbitals are half and completely filled, respectively in lanthanide ions :
[Given : Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]
JEE Main 2022 · 27 Jun, Evening shift · Q828