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(A) The oxidation state of an element in its compounds is determined by its group number and valence electrons.$Cs$ (Cesium) belongs to Group $1$ and

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$Cs$

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(A) The oxidation state of an element in its compounds is determined by its group number and valence electrons.$Cs$ (Cesium) belongs to Group $1$ and exhibits an oxidation state of $+1$.$Ca$ (Calcium) belongs to Group $2$ and exhibits an oxidation state of $+2$.$Mg$ (Magnesium) belongs to Group $2$ and exhibits an oxidation state of $+2$.$Al$ (Aluminum) belongs to Group $13$ and exhibits an oxidation state of $+3$.Comparing these values,$Cs$ has the lowest oxidation state of $+1$.

Which of the following elements exhibits the lowest oxidation state in its compounds?

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