Which of the following transition metal cation has maxi- mum unpaired electrons?

Which transition metal cation has maximum unpaired electrons ?

Which has no unpaired electrons?

Name the metal of the 1^(st) row transition series that has maximum no. of unpaired electrons in its ground state.

Which of the following has maximum unpaired electrons ?

Which one of the transition metal ions have no unpaired electron

Which one of the following first series of transition elements has 5 unpaired electron in its+2 oxidation state?

Which of the following has maximum unpaired d-electrons?