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Ionic compound
Substance containing ions, formed by the loss and gain of electrons between two or more elements.
Lattice structure
Regular grid-like repeating arrangement of particles such as atoms, molecules or ions.
Crystals
Solids that are made up of a regular repeated pattern of atoms, molecules or ions, which form fixed shapes with flat surfaces and sharp edges.
Polyatomic ions
A group of atoms that have a positive or negative charge due to the loss or gain of electrons.
