1. Quelle affirmation décrit correctement la structure d’un atome électriquement neutre ?
2. Quel ordre de grandeur correspond au diamètre du noyau d’un atome ?
3. Que représente le nombre de masse noté A ?
Structure de l’atome — composants ?
Électrons autour d’un noyau
Noyau — charge ?
Positive
Nucléons — définition ?
Protons et neutrons dans le noyau
Z — signification ?
Nombre de protons
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