Hydrogen molecule model
In the alley you are walking through you can see two low columns, each topped with one blue dot. Those dots represent the nuclei of hydrogen atoms that form an H2 molecule.
How does it work
Every atom consists of a nucleus and an electron cloud which surrounds it. Almost the whole mass of an atom is located in the nucleus. Hydrogen nuclei in an H2 molecule are 0.073 nm apart; our model is over 500 billion times larger than an actual molecule. The linear scale of the nucleus size and distance was maintained. This demonstrates how uneven the mass distribution is in matter.
As late as the beginning of the 20th century some scientists didn’t believe atoms existed. Such names as Wilhelm Ostwald or Ernst Mach can be mentioned here. Explaining the atomic and molecular structure was made possible thanks to the quantum theory developed in the first three decades of the 20th century.