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The highest oxidation states of transition metals are stabilised when they are bonded to two particular elements, A and B. These elements are:

1. F, O
2. O, N
3. O, Cl
4. F, Cl

Correct answer: F, O

Solution

Fluorine and oxygen, being highly electronegative and able to form strong sigma (and oxygen pi) bonds, stabilise the highest oxidation states of transition elements.

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