Understanding Bohr's Model: Electrons Gaining/Losing Energy

It's my civic duty to tell the classic tale to future generations, titled "The Little Electron That Could".
This little electron, with the smallest amount of energy on the atom, had dreams of growing up and gaining energy. Using the "ladder model", this little electron had to be aligned exactly in order to shift energy levels. There could not be energy shifts if electrons occupied the space that a fellow electron wanted to move into. Using this, Bohr was able to figure out how many electrons each energy level could maintain.

Photo above: The Ladder Model