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(C) The paramagnetism of transition elements in a given series depends on the number of unpaired electrons in the $d$-orbitals. As we move from left t

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first increases to a maximum and then decreases

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(C) The paramagnetism of transition elements in a given series depends on the number of unpaired electrons in the $d$-orbitals. As we move from left to right across a transition series,the number of unpaired electrons increases until the $d^5$ configuration is reached. Consequently,the paramagnetism increases to a maximum value at the $d^5$ configuration. Beyond $d^5$,the electrons begin to pair up in the $d$-orbitals ($d^6$ to $d^{10}$),which leads to a decrease in the number of unpaired electrons and thus a decrease in paramagnetism. Therefore,the paramagnetism first increases to a maximum and then decreases.

In a transition series,with an increase in atomic number,the paramagnetism:

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