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(C) For transition elements,as the atomic number increases,electrons enter the empty $d$-orbitals. Initially,the $d$-orbitals are singly occupied,whic

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first increases to a maximum and then decreases

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(C) For transition elements,as the atomic number increases,electrons enter the empty $d$-orbitals. Initially,the $d$-orbitals are singly occupied,which increases the number of unpaired electrons and thus increases paramagnetism. This continues until the $d$-orbitals are half-filled ($d^5$ configuration),which corresponds to the point of maximum paramagnetism. Beyond this point,electrons start pairing up in the $d$-orbitals,which reduces the number of unpaired electrons and consequently decreases paramagnetism. Therefore,paramagnetism first increases to a maximum and then decreases.

In a transition series,as the atomic number increases,paramagnetism

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