The correct statement(s) about transition ele | vedclass

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(D) $1$. The stability of the $+3$ oxidation state generally decreases across the $3d$ series as the nuclear charge increases,making it harder to remo

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All of the above.

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(D) $1$. The stability of the $+3$ oxidation state generally decreases across the $3d$ series as the nuclear charge increases,making it harder to remove the third electron.$2$. In the $3d$ series,from $Cr$ $(Z=24)$ to $Cu$ $(Z=29)$,the atomic radii remain almost constant because the increase in nuclear charge is balanced by the shielding effect of $d$-electrons.$3$. The stability of the $+2$ oxidation state increases across the period because the ionization energy required to remove two electrons increases,but the hydration energy or lattice energy compensates for this,making the $+2$ state more common for later elements like $Ni^{2+}$ and $Cu^{2+}$.

The correct statement$(s)$ about transition elements is/are:

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