BITSAT 2019 Slot 2 Solved Paper

Electronic configuration of the given species are
a. Sm2+(Z=62)=[Xe]4f6b. Eu2+(Z=63)=[Xe]4f7c. Yb2+(Z=70)=[Xe]4f14d. Ce2+(Z=58)=[Xe]4f15d1
On the basis of above electronic configuration, only Yb2+(Z=70) has no unpaired electrons i.e. has fully-filled orbitals. Thus it is dimagnetic in nature.