This all depends on your philosophy and definition of reality. When you get into stuff as far from everyday life as electrons, our intuitive definitions don't w

This all depends on your philosophy and definition of reality. When you get into stuff as far from everyday life as electrons, our intuitive definitions don't work very well. Most scientists, I think, use some definitions along the lines of "Reality is whatever appears in our best models/explanations of our observations of the world". If all observations of electrons we have ever made obey some law, we say that's the real behaviour of electrons. If we find out it doesn't always work, we realize reality is something more complex, and at some point hopefully we find out what it is.