MolecularEntity

ChemicalEntity

Methane, may mean a single molecule of CH4 (molecular entity) or a molar amount, specified or not (chemical species), participating in a reaction. The degree of precision necessary to describe a molecular entity depends on the context. Molecular entity is used as a general term for singular entities, irrespective of their nature, while chemical species stands for sets or ensembles of molecular entities. Note that the name of a compound may refer to the respective molecular entity or to the chemical species, This concept is strictly related to chemistry. For this reason an atom can be considered the smallest entity that can be considered "molecular", including nucleus when they are seen as ions (e.g. H⁺, He⁺⁺). Any constitutionally or isotopically distinct atom, molecule, ion, ion pair, radical, radical ion, complex, conformer etc., identifiable as a separately distinguishable entity that can undergo a chemical reaction. Hydrogen molecule is an adequate definition of a certain molecular entity for some purposes, whereas for others it is necessary to distinguish the electronic state and/or vibrational state and/or nuclear spin, etc. of the hydrogen molecule.

http://emmo.info/emmo#EMMO_21205421_5783_4d3e_81e5_10c5d894a88a

Methane, may mean a single molecule of CH4 (molecular entity) or a molar amount, specified or not (chemical species), participating in a reaction. The degree of precision necessary to describe a molecular entity depends on the context.

Molecular entity is used as a general term for singular entities, irrespective of their nature, while chemical species stands for sets or ensembles of molecular entities. Note that the name of a compound may refer to the respective molecular entity or to the chemical species,

This concept is strictly related to chemistry. For this reason an atom can be considered the smallest entity that can be considered "molecular", including nucleus when they are seen as ions (e.g. H⁺, He⁺⁺).

Any constitutionally or isotopically distinct atom, molecule, ion, ion pair, radical, radical ion, complex, conformer etc., identifiable as a separately distinguishable entity that can undergo a chemical reaction.

Hydrogen molecule is an adequate definition of a certain molecular entity for some purposes, whereas for others it is necessary to distinguish the electronic state and/or vibrational state and/or nuclear spin, etc. of the hydrogen molecule.

ChemicalEntity

Any constitutionally or isotopically distinct atom, molecule, ion, ion pair, radical, radical ion, complex, conformer etc., identifiable as a separately distinguishable entity that can undergo a chemical reaction.

Methane, may mean a single molecule of CH4 (molecular entity) or a molar amount, specified or not (chemical species), participating in a reaction. The degree of precision necessary to describe a molecular entity depends on the context.

Hydrogen molecule is an adequate definition of a certain molecular entity for some purposes, whereas for others it is necessary to distinguish the electronic state and/or vibrational state and/or nuclear spin, etc. of the hydrogen molecule.

Molecular entity is used as a general term for singular entities, irrespective of their nature, while chemical species stands for sets or ensembles of molecular entities. Note that the name of a compound may refer to the respective molecular entity or to the chemical species,

This concept is strictly related to chemistry. For this reason an atom can be considered the smallest entity that can be considered "molecular", including nucleus when they are seen as ions (e.g. H⁺, He⁺⁺).

https://goldbook.iupac.org/terms/view/M03986

emmo:EMMO_21205421_5783_4d3e_81e5_10c5d894a88a

EMMO_21205421_5783_4d3e_81e5_10c5d894a88a

MolecularEntity

https://goldbook.iupac.org/terms/view/M03986

http://emmo.info/emmo#EMMO_5b2222df_4da6_442f_8244_96e9e45887d1

http://emmo.info/emmo#EMMO_8b1367d6_0133_4b56_acc1_fa8b058169e3