If number of t 2 g and e g electrons are 3 and 2 respectively in hexa aqua complex of 3 d series metal ion M 3 + , find atomic number of metal M . Fill your answer as sum of digits till you get th

Question

If number of t 2 g ​ and e g ​ electrons are 3 and 2 respectively in hexa aqua complex of 3 d series metal ion M 3 + , find atomic number of metal M . Fill your answer as sum of digits till you get the single digit answer.

TestHub · Accepted Answer

The given electron configuration for the $M^{3 +}$ ion is $t_{2 g}^{3} e_{g}^{2}$ . This indicates a $d^{5}$ configuration.

For a $3 d$ series metal ion $M^{3 +}$ with $d^{5}$ configuration, the neutral metal $M$ must have $3 d^{6} 4 s^{2}$ configuration (since it loses three electrons: two from $4 s$ and one from $3 d$ ).

This corresponds to Iron (Fe), which has an atomic number of 26.

Sum of digits: $2 + 6 = 8$ .

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