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(A) The density of transition metals generally increases across a period as the atomic mass increases and atomic volume decreases due to the contracti

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$Sc$

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(A) The density of transition metals generally increases across a period as the atomic mass increases and atomic volume decreases due to the contraction of $d$-orbitals.Among the given $3d$ transition metals,$Sc$ (Scandium) has the lowest atomic mass and a relatively larger atomic volume compared to the others ($Ti$,$V$,$Cr$).Therefore,$Sc$ has the lowest density among the options provided.

Which of the following transition metals has the lowest density?

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