Question

Which of the first row transition metal exhibit +7 oxidation state?

Answer 1

Answer: Manganese is the transition metal which is present in first row and exist in +7 oxidation state.

Explanation:

Oxidation state is defined as the numerical value which is given to a chemical specie or element which represents the number of electrons lost (positive oxidation state) or gained (negative oxidation state) by an element in a compound.

Transition metals have a tendency to show variable oxidation state and he element which exhibits +7 oxidation number is manganese.

Electronic configuration of manganese: $[Ar]4s^23d^5$

This element looses all 7 electrons to form +7 oxidation state. For Example: $Mn_2O_7\text{ or }MnO_4^-$ In these compounds, manganese has +7 oxidation state.

Hence, manganese is the transition metal which is present in first row and exist in +7 oxidation state.

Answer 2

Answer:

Manganese (Mn) shows +2 to +7 oxidation state.