chem modelsofparticulatenatureofmatter
Structure 1.4.1 - the mole (mol) is the SI unit of amount of substance, it is used for counting entities. one mole contains exactly the number of elementary entities given by the Avogadro constant
avogadro’s constant
the avogadro number is
the term elementary entity is used to cover the broad range of possible particles. an elementary entity might be an atom, a molecule, an ion, an electron, any other particle or a specified group of particles