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Copper has a [Ar]4s1 4d10 whereas Chromium has a [Ar]4s14d5 electron configuration as this d shell configuration of either half full d shell (5 electrons) with only one electron per orbital or fully full ...

• Forward and backward reactions occur at equal rates
• Concentration of reactants and products remains constant

Enthalpy change refers to the change in heat pressure given out or taken in by a system when the pressure is constant.

A substance that can accept a proton (H+)

A substance that donates a proton (H+)