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L'atome de magnésium de numéro un atome de magnésium Mg a un numéro atomique Z=12,de nombre nucléons A=24 et de symbole Mg, forme un cation en perdant deux électrons.
1-Écrire la formule de cet ion
2-Déterminer le nombre de pontons et de neutrons de cet ion

Sagot :

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