Copper used in electric wires comes in two flavors (isotopes): 63cu and 65cu. 63cu has
an atomic mass of 62.9298 amu and an abundance of 69.09%. the other isotope, 65cu.
has an abundance of 30.91%. the average atomic mass between these two isotopes is
63.546 amu. calculate the actual atomic mass of 65cu.

What are the 4 phases of matter in order of increasing engery content?

What is a metal replacement reaction

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!