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- lone pair
- In a covalently bonded moleculeA set of atoms joined by covalent bonds and having no net charge. or ionAn atom or covalently bonded set of atoms that carries an overall net charge., a pair of electrons not shared between two 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. and hence not involved in a bond.