Only the group 1B transition elements form simple compounds in which the oxidation state of the metal is + 1 . For all of the other transition elements, the lowest positive oxidation state is + 2 . The common feature in the electron configuration of the transition elements contributes to this fact has to be given.

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Chapter 19, Problem 19.7QE

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Only the group 1B transition elements form simple compounds in which the oxidation state of the metal is +1. For all of the other transition elements, the lowest positive oxidation state is +2 . The common feature in the electron configuration of the transition elements contributes to this fact has to be given.

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