Which of the following is correctly explained by lanthanide contraction?....

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Which of the following is correctly explained by
\( \mathrm{P} \)
lanthanide contraction?
W
(1) Same oxidation State of \( \mathrm{Zr} \) and \( \mathrm{Zn} \).
(2) Similar radius of \( \mathrm{Zr} \) and \( \mathrm{Hf} \).
(3) Similar radius of \( \mathrm{Zr} \) and \( \mathrm{Y} \).
(4) All of the above


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