Which element exhibits highest density in \( 3 \mathrm{~d} \) series (1) \( \mathrm{Sc} \) (2) \...

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Which element exhibits highest density in \( 3 \mathrm{~d} \) series
(1) \( \mathrm{Sc} \)
(2) \( \mathrm{Cr} \)
(3) \( \mathrm{Zn} \)
(4) \( \mathrm{Cu} \)
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