Which metal in the 3d series exhibits +1 oxidation state most frequently and why?

Short/Brief Note

1. The first transition metal copper exhibits only +1 oxidation state.

2. It is unique in 3d series having a stable +1 oxidation state.

Cu (Z = 29)

Electronic configuration is [Ar] 3d¹⁰ 4s²

3. So copper element only can have +1 oxidation state.

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Chapter 4: Transition and Inner Transition Elements - Evaluation [Page 129]

Chapter 4 Transition and Inner Transition Elements
Evaluation | Q 25. | Page 129

Which one of the following ions has the same number of unpaired electrons as present in V³⁺?

The magnetic moment of Mn²⁺ ion is ____________.

Complete the following.

\[\ce{MnO^2-_4 + H^+ ->?}\]

Calculate the number of unpaired electrons in Ti³⁺, Mn²⁺ and calculate the spin only magnetic moment.

Explain briefly how +2 states become more and more stable in the first half of the first-row transition elements with increasing atomic numbers.

Explain the variation in `"E"_ ("M"^(3+)//"M"^(2+))^0` 3d series.

Compare the ionization enthalpies of the first series of the transition elements.

The `"E"_("M"^(2+)//"M")^0` value for copper is positive. Suggest a possible reason for this.

Why first ionization enthalpy of chromium is lower than that of zinc?

Transition metals show high melting points why?