Therefore, electrons cannot be arranged at random, but they must have fixed levels of energy within each type of atom. Bohr's 'solar system' model of the atom is the way that most people think ...

In school, you probably learned that an atom was like a little solar system with the nucleus as ... the math tells us that if this simplistic model was accurate, matter would be volatile.

They are all part of the Maine Solar System Model, a representation of the solar system that stretches 40 miles from the University of Maine in Presque Isle to Houlton. The 20-year-old model was ...