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Nombre électrons celibs


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Go to solution Solved by Natachatte,

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Bonjour! 
je peux pas mettre de photo mais dans l’annale de rangueil 2018, qcm 4, on doit trouver le nbr d’électrons celibs et pour le nickel (Z=18), je trouve 8e celibs ( [18Ar] 3d8 4s2) car les 8 e sur la couche d sont bien seuls nn? 
dans la correction il y a 2 e celibs donc je ne comprend pas. Merciiii 

 

Z=28*
 

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