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428
@428
June 2021
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donnez le symbole DE l'élément formé de 40 nucleon et DE 20neutron
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THUILLIER
Hello ! Tu sais que A(nucléons)= Z(protons) + N(neutrons).
Donc Z = A-N
Z = 40-20
Z = 20 Il y a 20 protons dans l'élément cherché.
Tu prends ensuite un tableau périodique et tu trouves que le Calcium a 20 protons.
Voilà
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Donc Z = A-N
Z = 40-20
Z = 20 Il y a 20 protons dans l'élément cherché.
Tu prends ensuite un tableau périodique et tu trouves que le Calcium a 20 protons.
Voilà