Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Periodic Table
The atomic radii of Zr and Hf are almost identical. This is because of
1
change in effective atomic number
2
lanthanoid contraction
3
actinoid contraction
4
More than one of the above
5
None of the above