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The lanthanide contraction is responsible for the fact that:
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Correct option is A
Group 4 contains both and (d-block). atomic radius (160 pm) is relatively close to (159 pm).
The lanthanide contraction causes and to have comparable characteristics. With an increase in atomic number and effective nuclear charge, the size of and becomes virtually identical, and as a result, both have similar properties. This is because the electrons in the f-subshell do not have a good shielding effect.
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