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Regarding the transition elements, which statement is INCORRECT?

1. In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons participate in bonding
2. Beyond the d5 configuration, the tendency to use all 3d electrons in bonding decreases
3. Besides their usual oxidation states, these elements can also show the zero oxidation state in complexes
4. In their highest oxidation states the transition metals behave as bases and form cationic complexes

Correct answer: In their highest oxidation states the transition metals behave as bases and form cationic complexes

Solution

In their highest oxidation states transition metals show acidic (not basic) character and form anionic oxo species such as MnO4- and Cr2O7²-, so that statement is incorrect.

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