ATOMIC STRUCTURE
3.3 - Arrangement of Electrons
3.3.1 - The Bohr Model of the Atom
Analogy to the Concept of Energy Levels
An analogy to the concept of energy level is a person walking up a flight of stairs, where the steps continually get smaller as they go up.
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As the person proceeds up the steps, he changes his position and hence his potential energy. Each step of the staircase corresponds to a different energy level. Whe the person puts his foot on a step, he is at the energy level of that step. He cannot put his foot in between the steps, therefore, he cannot be at an "in-between" energy.
The person here is like the electrons. Likewise, the energy of the electrons can only have specific energy values associated with the energy levels.