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Molekyle

I kemi er et molekyle en sammens�tning af to eller flere atomer.

For eksempel er vand (H₂O) et molekyle, der best�r af 2 hydrogen atomer og 1 oxygen atom.

Et molekyle er karakteriseret ved, at alle atomerne i molekylet er bundet sammen ved hj�lp af kovalente bindinger, dvs. at atomerne deler et eller flere elektronpar imellem sig, i mods�tning til salte, der kun h�nger sammen ved hj�lp af elektrostatiske kr�fter (ion-ion-tiltr�kning).