How do you represent electrons in box notation?
1 electron - half arrow
2 electrons - half arrow one way, half the other
How do you fill up subshells?
Only pair electrons up after filling all of that box.
What is the order of stability in sub shells?
What are the exceptions to the electron configuration process?
Copper: 1s2 2s2 2p6 3s2 3p6 4s1 3d10
Chromium: 1s2 2s2 2p6 3s2 3p6 4s1 3d5