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1) A solid is the result of atoms and electrons interacting so that they form a stable form in which the nuclei are localized with respect to the origin on the solid, but still move due to thermal vibrations, etc at nonzero temperature. The electrons, depending on their shell either stay localized at their nuclei, get exchanged forming a lower energetic bond or move through the material.
2) An idealized electron and proton, forming perhaps a hydrogen atom. From the picture only the charge is visible, nothing is said about its wavefunction or its real form.
3) Two idealized hydrogen atoms separated by a wall, perhaps they can tunnel through.
4) A very unstable Helium atom without any neutrons that would immediately fall apart.
5) although long, my definition was not far off. My reasoning was because Hamiltonians do not contain atoms but electrons and nuclei to describe potentials.
6) ~ -2?
7) +zero
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