Question

What powers electrons in their orbit, it seems to me they would slow down over time and stop moving and that would distroy the atom

Answer 1

They can't slow down. Even though the electron are moving in an elliptical orbit and might be expected to be emitting electromagnetic radiation which would cause them lose energy , they can't because there is no place for them to go. The energy of the electrons in an atom are quantized that is they have a fixed discrete values and here is only one electron allowed per energy state. In a normal unexcited atom all the lowest electron energy states are all filled up so they can't go anywhere.