Element: Cannot be broken by ordinary chemical processes, Always has the same ratio of elements, Iron, Helium, Only 92 of these occur in nature, Compound: Water, Always has the same ration of elements, Contains at least two kinds of atoms, Mixture: Contains two or more kinds of atoms, Air, Seawater, Almost all substances on earth are these,

Tauler de classificació

Estil visual

Opcions

Canvia de fonament

Restaurar desada automàtica: ?