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définitions chimie

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Chemistry
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Pôle urbain
Annales de chimie et de physique

Mati?re : Toute chose ayant une masse et occupant de l?espace. Atome: plus petite quantit? d?un ?l?ment ?lectriquement neutre qui poss?de encore les propri?t?s chimiques caract?ristiques de l??l?ment. Atome est form? d?un noyau entour? d??lectrons. La masse d?un atome est environ ?gale ? la somme de la masse des nucl?ons. Unit? de masse atomique : u ou uma = 1/12 de la masse atomique du 12 C. El?ment : constituants de base de la mati?re. Leurs diverses combinaisons constituent ensemble de la mati?re sur terre. L??l?ment est constitu? d?une seule sorte d?atome, ayant le m?me num?ro atomique, Z. Exemples : Mercure (Hg) liquide (monoatomique) Brome (Br2) liquide diatomique (mol?cule) Iode (I2) solide diatomique (mol?cule) Cuivre (Cu) solide (monoatomique)

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