A homogeneous substance that cannot be divided into simpler substances is defined as a chemical element.
The chemical elements that exist in nature are 92 and can be presented in a gaseous, liquid or solid state. From its union is formed all the matter that we observe in the Universe.
Chemical elements are for example: hydrogen, helium, oxygen, iron, uranium.
A substance formed by the union of two or more chemical elements is called a compound. Water, for example, is a compound formed by hydrogen and oxygen.
Astrophysics has been able to determine that in the entire visible universe the chemical elements are presented with the same relative abundance.
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