transition series and hafniun to 
transition series even then they
show similar physical and chemical properties because..............
(a) both belong to d
- block
(b) both
have same number of electrons
(c) both
have similar atomic radius
(d) both belong to
the same group of the Periodic Table
Answer:
(c,) Due to
lanthanoide contraction, Zr and Hf possess nearly same atomic and ionic radii i.e.,
Zr = 160 pm and Hf = 159 pm, 
= 79 pm and 
= 78 pm. Therefore, these two
elements show similar properties (physical and chemical
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