An atom_based state defined by an exact number of e-bonded atomic species and an electron cloud made of the shared electrons.
Molecule
[2,"smw-datavalue-wikipage-property-invalid-title","HasComment","An entity is called essential if removing one direct part will lead to a change in entity class.\n\nAn entity is called redundand if removing one direct part will not lead to a change in entity class.@en"]
[2,"smw-datavalue-wikipage-property-invalid-title","HasComment","This definition states that this object is a non-periodic set of atoms or a set with a finite periodicity.\n\nRemoving an atom from the state will result in another type of atom_based state.\n\ne.g. you cannot remove H from H20 without changing the molecule type (essential). However, you can remove a C from a nanotube (redundant). C60 fullerene is a molecule, since it has a finite periodicity and is made of a well defined number of atoms (essential). A C nanotube is not a molecule, since it has an infinite periodicity (redundant).@en"]