a quantum leap is when an electron gets excited, moving it to the next energy level, and then falls back down.  This falling back down produces energy in the form of light. (this is the reason neon lights and similar lights light up, the electrons get excited by the electricity, and the process of them falling down produces energy in the form of light. The color is determined by which energy level it is falling from and into, and usually remains consistent for each element.) Well anyway, the electron jumping from one energy level to the next is called a 'quantum leap'
what is a quantum leap?