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An ionic<span> crystal consists of </span>ions<span> bound together by electrostatic attraction. The arrangement of </span>ions<span> in a regular, geometric structure is called a crystal lattice. Examples of such </span>crystals<span> are the alkali halides, which include: potassium fluoride </span>
I believe the answer is 3 - He hypothesized that all substances can be broken down into a smallest part called the atom.
The answer is, All of the above
