Copper has two naturally occurring isotopes. copper-63, with an atomic mass of 62.94 u, makes up 69.17 percent of the sample, and copper-65, with an atomic mass of 64.93 u, makes up the other 30.83 percent. calculate the weighted average atomic mass of copper based on the given information. give your answer in a total of four significant figures

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.