In spite of the fact that zirconium has a place with 4d change series and hafnium to 5d change series and still, after all that they show comparative physical and substance properties in light of the fact that (a) both have a place with d-block (b) both have same number of electrons (c) both have comparative nuclear span (d) both have a place with a similar gathering of the intermittent table
In spite of the fact that zirconium has a place with 4d change series and hafnium to 5d change series and still, after all that they show comparative physical and substance properties in light of the fact that (a) both have a place with d-block (b) both have same number of electrons (c) both have comparative nuclear span (d) both have a place with a similar gathering of the intermittent table

Solution:

(c) Zirconium and hafnium have comparable nuclear range thus they show comparable physical and synthetic properties.