Which of the following is correct?....

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Which of the following is correct?
P
(1) The metallic radii values are equivalent for iron, cobalt, and nickel.
(2) Across the first transition series, the density of the metals increases and then decreases at zinc
(3) The \( \mathrm{E}_{\left(\mathrm{M}^{2+} / \mathrm{M}\right)}^{\circ} \) value is positive for copper.
(4) All are correct.


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