Question

I have a question related to quantum mechanics here.
As many of us may know about electrom spin theory which says that electrons can only have a upside down or upfront spin and that two electrons cannot be same because of it in a particular shell (they will have difference in their energy levels) , so i want to ask that if we follow this theory then there can be only one upfront spinning and one upside down spinning electron in one shell, that is total two electrons only, so how can a shell occupy more than two electrons?

Answer 1

brother electrons present in P,D,F shells are in bunch of two. if you saw the diagram of p subshell, there are three doumble shapes each having two electrons of opposite spin... when we talk about d subshell there is five double doumble shapes each contains 2 electrons. hence shells contains more than 2 electrons