A) both belong to same group
B) diagonal relationship
C) lanthanide contraction
D) having similar chemical properties
Correct Answer: C
Solution :
In long form of periodic table, Zr (Z = 40) and Zr (Z = 72) are placed in group 4. Elements after La (Z = 57) are called lanthanides. Due to lanthanides contraction radius of Hf is nearly same as that of Zr.
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