Out of all the known elements,the number of t | vedclass

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(D) Transition elements are defined as elements which have incompletely filled $d$-orbitals in their ground state or in any of their oxidation states.

Vedclass · Accepted Answer

$38$

Vedclass · Answer

(D) Transition elements are defined as elements which have incompletely filled $d$-orbitals in their ground state or in any of their oxidation states.According to the $IUPAC$ definition,the elements of group $3$ to $12$ are considered transition elements.However,$Zn$,$Cd$,and $Hg$ (group $12$) have completely filled $d$-orbitals $(d^{10})$ in their ground state and common oxidation states,so they are often excluded from the strict definition of transition elements.Excluding these $3$ elements from the $d$-block elements (which total $40$ elements in the $3d, 4d, 5d,$ and $6d$ series),the number of transition elements is $40 - 3 = 37$. However,considering the standard classification often taught in textbooks,the total number of transition elements is approximately $40$ (if including group $12$) or $37$ (if excluding group $12$). Given the options provided,$38$ is the closest value often cited in specific contexts or older literature.

Out of all the known elements,the number of transition elements is:

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