Element X has two stable isotopes, X-69 and X-71. X-69 has a molar mass of 68.92 g/mol and a relative abundance of 60.11 %. X-71 has a molar mass of 70.92 g/mol and abundance of 39.89%.
What is the average atomic mass of X?
What is element X?
How many protons, electrons and neutrons are in Cu-64 with a charge of +1?