What is the group number of the -block element whose common divalent cation () in the series possesses the theoretical maximum number of unpaired electrons in its ground state?

Question

What is the group number of the $d$ -block element whose common divalent cation ($M^{2+}$) in the $3d$ series possesses the theoretical maximum number of unpaired electrons in its ground state?

Prashant Kotian · Accepted Answer

Correct answer: 7. The -orbital can hold a maximum of 5 unpaired electrons (a configuration). In the series, the divalent cation with a configuration is . Manganese (, ) has a neutral ground state configuration of . In the modern periodic table, belongs to Group 7.

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