+91-8076753736 support@wiredfaculty.com

Sponsor Area

The D-And-f-Block Elements

Question

Wired Faculty App

Why does Zr and Hf exhibit similar properties?

Solution

Zr and Hf exhibit similar properties due to lanthanoid contractin. Electrons present in f subshell didn't do good shielding due to which with the increasing atomic number or increasing effective nuclear charge size gets constricted and size of Halfenium and Zirconium becomes almost equal.

2(40) = [Kr]₃₆4d² 5s², Hf(72) = [Xe]₅₄ 4f¹⁴ 5d² 6s²

Some More Questions From The d-And-f-Block Elements Chapter

Silver atom has a completely filled d orbitals (4d¹⁰) in its ground state. How can you say that it is a transition element?

In the series Sc (Z = 21) to Zn(Z = 30), the enthalpy of atomisation of zinc is the lowest i.e., 26, kJ mol. Why?

The E° (M²⁺/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this?

How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?

Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

Which is a stronger reducing agent Cr²⁺ or Fe²⁺ and why?

Explain why Cu⁺ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation