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Among $$\text{Ti}^{2+}$$, $$\text{Co}^{3+}$$, $$\text{Mn}^{3+}$$, $$\text{Ni}^{2+}$$ the number ions with two unpaired electrons _____________
Correct Answer: 2
$$\text{Ti}^{2+}$$ is $$3d^2$$ with 2 unpaired electrons, $$\text{Co}^{3+}$$ is $$3d^6$$ with 4, $$\text{Mn}^{3+}$$ is $$3d^4$$ with 4, and $$\text{Ni}^{2+}$$ is $$3d^8$$ with 2. So 2 ions, $$\text{Ti}^{2+}$$ and $$\text{Ni}^{2+}$$, have two unpaired electrons.
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