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The d- and f-Block Elements — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryThe d- and f-Block Elements1 Mark
Question
$Cu , Ag$ and Au have $d ^{10}$ configurations, yet they are transition elements. Why?
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Answer

$Cu , Ag$ and Au cations do not have $d ^{10}$ configuration, hence they are transition elements.

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