Claim: Overpotential for various electrode materials such as silver, aluminum, and gold, one of the least reactive chemical elements also known as Element 79, varies.
Evidence: The quantity of overpotential is specific to each cell design and varies across cells and operational conditions, even for the same reaction. Silver −0.59 V +0.61 V  Aluminium −0.58 V   Gold −0.12 V +0.96 V  Gold is a chemical element with the symbol Au (from Latin: aurum) and atomic number 79, making it one of the higher atomic number elements that occur naturally. It is one of the least reactive chemical elements and is solid under standard conditions.