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Chemazone - Online Catalog - Millions of Stocked Compounds.
Connections. Chemical formulas.
Atoms enter into a chemical bond by interacting with external electron shells, and form molecules or non-molecular structures with a regular structure. Substances whose particles are stable combinations of atoms or ions are called chemical compounds.
Chemical designations of compounds – formulas – reflect the elemental composition and the number of atoms of each element in the structural unit of the substance. The formula H2 means that a substance molecule is formed by one element and consists of two atoms. According to the KNO3 formula, it can be seen that the substance is composed of three elements – potassium, nitrogen and oxygen in a ratio of 1:1:3.
Chemazone - Online Catalog - Millions of Stocked Compounds.
Simple substances.
Simple is a substance consisting of the same type of atoms, that is, formed by one element. It cannot be decomposed into other substances.
Simple substances are divided into two groups:
metals: sodium, aluminum, manganese, gold, iron, etc.;
nonmetals: oxygen, ozone, hydrogen, chlorine, graphite, etc.
If atoms are bound into molecules, then a simple substance is considered a compound (bromine, phosphorus, most gases). Unlike them, metals, diamond, graphite, and inert gases are atomic substances.
Element and substance.
The concept of a simple substance must be distinguished from the concept of a chemical element. An element is a collection of chemically identical atoms. In its free form, it exists in the form of a natural or artificial simple substance.
