Because placing it further away increases the energy of our system. And nature tends to take the lowest energy state. So that's exactly why when we look at the principal quantum numbers as our principal quantum numbers increase as we go from n equals one to n equals two to n equals three, or from Orbital S P to D. Our energy will increase as we go down this table. So now let's talk about electron configuration. Electron configuration is simply a systematic approach to representing and showing exactly where our electrons are placed within any given atom. In other words, in which shells or in which subshells are our electrons down?