Why would an element have two different atomic masses?

It forms Isotopes

It forms bonds so the other elements mass needs to be counted

It is a molecule

It is a compound

On your wedding day your lover gives you a gold ring of mass 3.67 g. 48 years later its mass is 3.44 g. on the average how many atoms were abrated from the ring during each second of your marriage? the atomic mass of gold is 197 u. don't enter units