Among 3d transition series the IE

In 3d-transition series with increase in nuclear charge, the screening effect

Although zirconium belongs to 4d transition series and hafnium to 5d transition series even then they show similar physical and chemical properties because …….. .

Although zirconium belongs to 4d transition series and hafnium to 5d transition series even then they show similar physical and chemical properties because -

Although zirconium belongs to 4d transition series and hafnium to 5d transition series even then they show similar physical and chemical properties because …….. .

Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show similar physical and chemical properties because