Question
Write the properties of $d$-block element.
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Answer
The properties of $d$-block elements are as follows: The elements belongs to group $3^{\text {rd }}$ to $12^{\text {th }}$ of periodic table are known as d-block elements. Their last electron enters in ( $n -1$ ) d orbitals. The outermost electronic configuration of these elements is $(n-1) d^{1-10}$ $ns ^{0-2}$ (where $n =4$ to 7 ). All of these elements are metals. The ions of these elements are generally coloured and represent the oxidation state and paramagnetism. They are also used as catalyst. $Zn , Cd$ and Hg (group 12) are non-transition elements although they have general electronic configuration $( n -1) d ^{10} ns^2$.
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