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Question

Which of the following element has the highest density among transition metals?

A
Iridium
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B
Tungsten
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C
Scandium
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D
Iron
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Solution

The correct option is A Iridium
Down the group in d-block size doesn't increase as much because of poor shielding of f-orbitals. So, volume doesn't increase much but mass increases, hence, density increases.
Across the group in d-series, density increase due to decrease in radii and increase in atomic mass.

Hence, Iridium has the highest density among others.
Hence, option (a) is correct.

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