1.) why were coins originally made from precious metals such as gold or silver rather than cheaper metals such as copper? 2.) what is the major difference in metal composition of canadian coins compared with american ones?

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.