For Einstein, he postulated that any explaination of what goes on 'inside' the atom cannot be the full story. This is why he disagrees with proponents of quantum physics.
For today's quantum theorists, the problem of knowning both position and location of any particle sets up a fallacy known as "non-locality". For the late great quantum physicists Niels Bohr revealed that mathematical symbolic notions DO NOT REPRESENT REALITY, THEY ARE STATISTICAL PREDICTIONS, an attempt to guess either location or speed. This is why Einstein said, "God does not play dice with the universe."