Question

Which of the following statement(s) is/are incorrect for pair of element Zr-Hf ?
A. Both posses same number of valence electrons
B. Both have identical sizes
C. Both have almost identical radii
D. Both of these belong to same period of periodic table

Answer 1

Correct Answer - D
Zirconium (Zr)with atomic number - 40and Hafnium (Hf) with atomic number - 72 belongs of period 5th and 6th respectively.