Question

how many unpaired electrons in d block element ?? ........

Answer 1

Elements lying in d-block have their valence electron in d orbital. Thus they can have maximum of 5 unpaired electron.

Answer 2

There are four principle orbitals (s, p, d, and f) which are filled according to the energy level and valence electrons of the element. All four orbitals can hold different number of electrons. The s-orbital can hold 2 electrons, and the other three orbitals can hold up to 6, 10, and 14 electrons, respectively.