JEE Main 20264 Apr, Evening shiftChemistryMediumd- and f-Block Elements158× since 2002
Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number. Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72] A. (Eu and Gd) B. (Dy and Ho) C. (Yb and Hf) D. (Lu and Tm). Choose the correct answer from the options given below: