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Théophile-Jules Pelouze

divers notions de chimie

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Chemistry
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Chemistry
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Annales de chimie et de physique
Théophile-Jules Pelouze

R?sum? Chimie: Partie 3-4 La r?activit? des ?l?ments d?pend de 4 facteurs: Le rayon de l?atome L??nergie d?ionisation?: L??nergie que l?on doit fournir ? un atome pour arracher l??lectron le moins li? ? l??tat gazeux et former un cation L??lectroaffinit??: Quantit? d??nergie d?gag?e par la capture d?un ?lectron par un atome ? l??tat gazeux. Plus l??lectroaffinit? est grande, plus la capture d??lectron d?gage de l??nergie et est stable. Si l?affinit? ?lectronique est n?gative, il faut fournir de l??nergie ? cet atome pour lui attacher un ?lectron L??lectron?gativit??: Mesure de la capacit? d?un ?l?ment ? tirer les ?lectrons vers lui dans une liaison covalente.
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