Can someone explain how spin allows elctrons to pair

[rollcast]

I never understood this how do 2 like charges stay together, the electro is it like eddy currents or something

 

[fzero]

I never understood this how do 2 like charges stay together, the electro is it like eddy currents or something

Spin doesn't allow electrons to stay together. I assume that you're talking about electrons in an atom. What happens is that the attraction of an electron to the nucleus is a bit stronger than the repulsion between the electrons. The bound state of the electrons and nucleus has a lower energy than the unbound state.

Pairing happens because the configuration with a spin up and spin down electron in a particular orbital state has lower energy than the configuration where one of the electrons is in that state and the other electron has the same spin and sits in the next higher energy state.