Answer: The anode is the metal that is higher on the list because it is more easily oxidized.
Explanation: The Anode of the voltaic cell is the electrode on which the process of oxidation takes place.
Oxidation is the process in which highly reactive metal which is higher in the electrochemical series loses electrons which goes into the solution.
Thus The anode is the metal that is higher on the list because it is more easily oxidized.
For eg- In a reaction cell of Copper-Iron, Iron(Fe) will get oxidized because it is placed higher in the electrochemical series whereas Copper(Cu) will get reduced.
The most abundant of all of the isotopes of an element will be the one who's mass the mass of element is closest to. In this case, the mass of atomic carbon is closest to the mass of carbon-12. Thus, Carbon-12 is the most abundant isotope.
