The very name "atom" comes from a Greek word which means "uncuttable" or "indivisible", and we already know that's no longer true. For a very long time, it was thought that the smallest building block of all matter was the atom. This is because she violates a basic law of physics that says two things can’t share the same space. A chain link fence is mostly empty space - why can't we walk through them??? If you try to take a walk in a swimming pool, though, the water's molecules are not so strongly bonded together. Bob suggests that it may be because like charges repel, but then if atoms are neutral then there would be no net charge. You can walk through it because you can move the water's molecules aside. Those of you who don't believe this just haven't looked closely enough. You can't walk through the walls because your atoms can't move aside for the wall's atoms, and the wall's atoms can't move aside for yours. Once all the charges are out of the way the atoms (now balls of neutrons) are free to collapse together. You've probably heard that the atoms that make up your body and all other normal matter in the Universe are mostly empty space. Then, you could no longer move the flakes aside, and you couldn't take a walk. You can't walk through the walls because your atoms can't move aside for the wall's atoms, and the wall's atoms can't move aside for yours. Addressing the fact that matter is mostly empty space, if you really squeeze matter you’ll find that the electrical forces can no longer hold atoms apart. You can't walk through the walls because your atoms can't move aside for the wall's atoms, and the wall's atoms can't move aside for yours. You can walk through it because you can move the water's molecules aside. That's actually true - yet we seem solid. If an atom is mostly empty space, why can't we walk through walls? Atoms bonded together are generally separated by amounts similar to radii (in fact, most covalent bond are significantly shorter than you'd expect from van der waals radii). And atoms in adjacent molecules in condensed matter like liquids and solids are not much farther than that. Alice wonders why Alice can’t walk through a wall if atoms consist mostly of empty space. We and everything else in the universe (including the barrier at King's Cross) are really just an assemblage of atoms and atoms are almost entirely empty space. A wall may be mostly "space" in a way, but it is made up of molecules that have molecular bonds with neighboring molecules - which hold each together in a giant atomic-link fence. From the perspective of atoms, though, matter is not mostly empty space. electric repulsion- the electrons on the outside of atoms repel one another if atoms are mostly empty space why cant we walk through a wall the electrons on the outside of atoms repel one another

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