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sara5893
@sara5893
February 2021
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▪Le role de l'appareil respiratoire
▪Les dangers qui menacent l appareil
▪Comment le prevenir
svp aidez moi et merci :)
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sara5893
October 2020 | 0 Respostas
svp aider moi jarrive pas cest pour demainL'atome de calcium possède 20 électrons.1.Donner la charge du noyau de l'atome decalcium.2. Quelle est la charge du noyau de l'ion decalcium ca2+ ?3.Quelle est la charge de l'ion de calcium ca2+ ?4.Quel est le nombre d'électrons de l'ion ca2+ ?
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