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Among the following elements, how many show only a single non-zero oxidation state (i.e., one characteristic oxidation state other than 0)? O, Cl, F, N, P, Sn, Tl, Na, Ti

1. 2
2. 3
3. 4
4. 5

Correct answer: 2

Solution

Only F (always -1) and Na (always +1) show a single non-zero oxidation state. O shows -2/-1/+2, Cl shows -1 to +7, N and P show many states, Sn (+2,+4), Tl (+1,+3) and Ti (+2,+3,+4) all show multiple.

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