NON-METALLIC ELEMENTS

**Definition:** This place covers:

The chemical elements of hydrogen, halogen (fluorine, chlorine, bromine, iodine and astatine), oxygen, sulfur, phosphorus, silicon, nitrogen, boron, selenium, tellurium, and noble gases (helium, neon, argon, krypton, xenon and radon).

Compounds solely composed of any of the elements listed above.

Carbon and compounds of carbon with any of the elements listed above, with the proviso that said compounds cannot contain a carbon atom having direct bonding to another carbon atom, a carbon atom having direct bonding to a hydrogen atom or a halogen atom, or a carbon atom having direct bonding to a nitrogen atom by a single or double bond.

Compounds composed solely of one or more metal atoms and hydrogen.

Peroxides and salts of peroxyacids.

Magnesium, calcium, strontium, or barium sulfides or polysulfides.

Alkali metal sulfides or polysulfides.

Thiosulfates, dithionites and polythionates.

Compounds containing selenium or tellurium.

Azides, metal amides and nitrites.

Carbamic acid and salts thereof.

Binary compounds containing a metal and either N, C or P.

Salts of the oxyacids of halogen or phosphorus.

Compounds consisting only of carbon atoms, e.g. fullerenes, carbon nanotubes.

Phosgene and thiophosgene.

Compounds containing silicon such as silicates, silicon oxides or colloidal silica, e.g. dispersions, gels, hydroorganosols, organosols.

Compounds containing boron.

Substances having molecular sieve properties, but not having base-exchange properties.

Substances having a combination of molecular sieve and base-exchange properties, e.g. crystalline zeolites.

Synthesis, treatment or modification of any of the elements or compounds above by:

Methods of preparing the following compounds, in general:

Apparatus:

**Limiting references (this place does not cover):** - Treatment of inorganic materials to enhance their pigmenting or filling properties; Preparation of carbon black -> C09C - Intentional preparation of carbon dioxide by a fermentation process or the use of an enzyme -> C12P1/00 - Preparation of elements or inorganic compounds except carbon dioxide, by a fermentation process or the use of an enzyme -> C12P3/00 - Production of non-metallic elements or inorganic compounds by electrolysis or electrophoresis -> C25B1/00

**Glossary:** - Base-exchange: The replacement of one cation absorbed on a material by another. - Binary compound: A compound containing and limited to two distinct chemical elements. - Direct bonding: Requires a bond between two adjacent atoms. - Inorganic compound: A compound devoid of a carbon atom and containing a non-metallic element, or a compound containing a carbon atom, and satisfying one of the following criteria: the compound cannot have a carbon atom having direct bonding to another carbon atom, or the compound cannot have direct bonding between a carbon atom and a halogen or hydrogen atom, or the compound cannot have direct bonding between a carbon and a nitrogen atom by a single or double bond. The following are exceptions to the above and are to be considered as inorganic compounds: compounds consisting of only carbon atoms, (e.g. fullerenes), cyanogen, cyanogen halides, cyanamide, phosgene, thiophosgene, hydrocyanic acid, isocyanic acid, isothiocyanic acid, fulminic acid, unsubstituted carbamic acid, and salts of the previously mentioned acids and which contain the same limitations as to a carbon atom. - Isomorphous zeolites: Compounds isomorphous to zeolites wherein the aluminum or silicon atoms in the framework are partly or wholly replaced by atoms of other elements, e.g. by gallium, germanium, phosphorus or boron. - Metal: Any element other than a non-metal. - Metal hydride: Compound containing only metal and hydrogen. - Molecular sieve: Materials (e.g. zeolitic, mesoporous) having cavities and channels which by their size allow some molecules to pass through, but prevent others. - Non-metal: The elements of hydrogen, carbon, halogen (fluorine, chlorine, bromine, iodine and astatine), oxygen, sulfur, phosphorus, silicon, nitrogen, boron, selenium, tellurium and noble gases (helium, neon, argon, krypton, xenon and radon). - Preparation: Covers synthesis, purification, separation, stabilisation, or use of additives, unless a separate place is provided in the classification scheme. - Zeolites: (i) Cystalline aluminosilicates with base-exchange and molecular sieve properties, having three dimensional, microporous lattice framework structure of tetrahedral oxide units; (ii) Compounds isomorphous to those of the former category, wherein the aluminium or silicon atoms in the framework are partly or wholly replaced by atoms of other elements, e.g. by gallium, germanium, phosphorus or boron.