Among Sc,Mn,Co and Cu,identify the element wi | vedclass

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(D)    Element Enthalpy of Atomisation $(	ext{kJ/mol})$   $Sc$ $326$   $Mn$ $281$   $Co$ $425$   $Cu$ $339$    The element with the highest enthalpy

Vedclass · Accepted Answer

$4$

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(D)    Element Enthalpy of Atomisation $(	ext{kJ/mol})$   $Sc$ $326$   $Mn$ $281$   $Co$ $425$   $Cu$ $339$    The element with the highest enthalpy of atomisation is $Co$ $(425 	ext{ kJ/mol})$. The electronic configuration of $Co$ is $[Ar] 3d^7 4s^2$. In its $+2$ oxidation state,$Co^{2+}$ has the configuration $[Ar] 3d^7$. The number of unpaired electrons $(n)$ in $3d^7$ is $3$. The spin-only magnetic moment is calculated as $\mu = \sqrt{n(n+2)} 	ext{ BM}$. $\mu = \sqrt{3(3+2)} = \sqrt{15} \approx 3.87 	ext{ BM}$. The nearest integer value is $4$.

Among $Sc$,$Mn$,$Co$ and $Cu$,identify the element with the highest enthalpy of atomisation. The spin-only magnetic moment value of that element in its $+2$ oxidation state is $......... \text{BM}$ (in nearest integer).

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