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

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Answer is: 4

Highest enthalpy of atomisation is Co among the given

\(Co = 3d^7 4s^2\)

\(Co^{2+} = 3d^7 4s^0\)

enthalpy of atomisation

\(\mu = \sqrt{n(n+2)} \ B.M.\)

\(\mu = 3.8 \ B.M.\)

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