Tabiatdagi zarrachalar.

Atom – kimyoviy elementning oddiy va murakkab moddalar molekulasi tarkibiga kiruvchi eng kichik zarrachasidir.

Molekula – ayni moddani kimyoviy hossalarini o’zida saqlovchi eng kichik zarracha. M; kislorod –O2,vodorod – H2,azot – N2.

Ion- bu zaryadlangan zarracha. Musbat zaryadlangan zarra Kation, manfiy zaryadlangan zarra Anion.

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