Représentation des atomes et des molécules


Comment sont représentées les molécules et les atomes ?

Chaque molécule est représentée par une formule chimique qui indique le symbole et le nombre des atomes qui la constituent. Le nombre de chaque sorte d'atome est indiqué en indice à droite du symbole. Prof: Lahcen SELLAK Chapitre 3: Les molécules et les atomes collège Tifnout 2APIC 8 / 15

Quelle est la notion de molécule ?

Notion de molécule et d'atome Corps simple et corps composé Le modèle moléculaire de l'air Notion de molécule et d'atome Les molécules  Une moléculeest un regroupement de plusieurs atomes identiques ou diérents liés entre eux.

Quelle est la notion de molécule et d'atome ?

Notion de molécule et d'atome Les molécules  Une moléculeest un regroupement de plusieurs atomes identiques ou diérents liés entre eux. Chaque molécule est représentée par une formule chimique qui indique le symbole et le nombre des atomes qui la constituent. Le nombre de chaque sorte d'atome est indiqué en indice à droite du symbole.

Comment sont modélisées les molécules ?

Les molécules étant des regroupements d'atomes, elles peuvent être modélisées en associant des modèle atomiques. • La molécule de dioxygène ( O2) : elle est constituée de deux atomes d'oxygène (dont le modèle est une boule rouge). Le modèle moléculaire du dioxygène est une association de deux boules rouges :

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