| ધાતુ આયન | $3d$ ઇલેક્ટ્રોનની સંખ્યા | $d$-કક્ષકોનું ભરાવું |
| $Ti^{2+}$ | $2$ | $t_{2g}^2 e_g^0$ |
| $V^{2+}$ | $3$ | $t_{2g}^3 e_g^0$ |
| $Cr^{3+}$ | $3$ | $t_{2g}^3 e_g^0$ |
| $Mn^{2+}$ | $5$ | $t_{2g}^3 e_g^2$ |
| $Fe^{2+}$ | $6$ | $t_{2g}^4 e_g^2$ |
| $Fe^{3+}$ | $5$ | $t_{2g}^3 e_g^2$ |
| $Co^{2+}$ | $7$ | $t_{2g}^5 e_g^2$ |
| $Ni^{2+}$ | $8$ | $t_{2g}^6 e_g^2$ |
| $Cu^{2+}$ | $9$ | $t_{2g}^6 e_g^3$ |
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