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annale chimie 22/23


Alma15
Go to solution Solved by NIcotine,

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Salut, pour écrire la configuration électronique de Fe (Z=26 => 26 électrons) on suit la règle de Klechkowski je te l'ai mis en pièce jointe, donc si on suit les flèche on a : 

1s2 2s2 2p6 3s2 3p6 4s2 3d6 --> on inverse 4s2 3d6 pour avoir n croissant => 1s2 2s2 2p6 3s2 3p6 3d6 4s2

Quand on additionne les électrons sur chaque couche on a bien 26 électrons (2+2+6+2+6+6+2= 26)

J'espère avoir pu t'aider !

SmartSelect_20231205_122506_Chrome.jpg

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