The number of atomsThe smallest particle of an element that can be involved in chemical combination with another element; an atom consists of protons and neutrons in a tiny, very dense nucleus, surrounded by electrons, which occupy most of its volume. to which a particular atom is bonded; in a coordination complexAn ion or molecule that consists of ligands bonded to a central metal ion or atom., the number of positions where ligands are attached to the central metalThe metal ion or atom at the center of a coordination complex to which the ligands are attached.; in a ionic compoundA compound containing oppositely charged ions held together by electrostatic attraction. Usually the ions are in a crystal lattice with positive ions surrounded by negative ions and negative ions surrounded by positive ions., the number of ions of opposite charge surrounding an ion.
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