1. The problem statement, all variables and given/known data Why are carbon, platinum and gold inert? 2. Relevant equations Duplet or Octet configuration 3. The attempt at a solution We use inert elements such as carbon, platinum and gold as the electrodes to prevent the electrodes react with the electrolyte. As far as I know the inert elements are noble gases only that satisfy the duplet (He element) or octet configuration. Since carbon, platinum and gold do not satisfy the duplet or octet configuration, why are they inert?