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marieange4
@marieange4
February 2021
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Bonsoir, j’aurais besoin d’aide svp !
Un ion est formé de 4 protons, 3 neutrons et 2 électrons. En déduire, en justifiant, la formule de cet ion.
Données : He(Z=2); Li(Z=3); Be(Z=4)
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