Tafelwit tasnawant

Amodel-agi ad-d-ibeggen iferdisen imezwura n 18 n tfelwit tasnawant s wesmel n tbenwit nsen tadamsant deg 3D. Yettawi-d tamuɣli ɣef protons, neutrons akked electrons, akked usegmi n ikerṭasen n electrons.