Chemical species

In chemistry, the term species is a generic name referring to a Atome (atomic chemical species) or to groups of dependant atoms which can, according to their electric Charge and them electronic Configuration, being is molecules, radical ions or .

One indicates a chemical species by the name of the molecule, the ion, the radical or the atom which constitute it.

Some examples:

  • the chemical species Argon is a chemical species atomic; its Chemical formula is: Ar.
  • the chemical species Méthyle is a chemical species ridicalizing; its chemical formula is: CH3•.
  • the chemical species Chlorure is a chemical species ionic; its Chemical formula is: Cl-.
  • the chemical species Diazote is a chemical species molecular; its Chemical formula is: N2.

Case of the ionic compounds

For the ionic compounds, one also speaks about chemical species although there are then at least two different ions, because those are indissociable and present in proportions fixed by the electroneutrality of the matter:

Examples:

  • the chemical species sodium chloride is consisted of the ionic chemical species chloride and sodium in equal proportions; its chemical formula is noted (Na+, Cl-) or NaCl.
  • the chemical species barium chloride is consisted of the ionic chemical species chloride and barium in proportions (2: 1); its chemical formula is (Ba2+, 2 Cl-) or BaCl2.

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