- Any two or more forms of the same element with different arrangements of atoms in their structures. For example, dioxygen (O2) and ozone (O3) are allotropes.
- A substance that contains more than one (usually metallic) element and has metallic properties, such as strength, conductivity, ductility, and malleability.
- A solid whose atoms or molecules are not arranged in regular, repeating patterns.
- A solid whose atoms or molecules are arranged in regular, repeating patterns in any direction throughout the solid.
- A small molecule that reacts to form covalent bonds with other monomer molecules over and over again to make a polymer.
- A large molecule formed by the joining together (through covalent bonds) of a large number of individual molecules with low molecular mass (known as monomers).
- The smallest repeating unit of atoms in a crystalline solid.
- A technique for determining the structure of a crystal by passing X-ray beams through it and analyzing how the repeating units of atoms diffracts (spreads) the X-rays.
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