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A - liczba masowa
X
Z - liczba atomowa
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I.
24
X₁
11
liczba protonów = Z = 11
liczba neutronów = N = A - Z = 24 - 11 = 13
II.
24
X₂
12
liczba protonów = Z = 12
liczba neutronów = A - Z = 24 - 12 = 12
LĄCZNIE:
liczba protonów = 11 + 12 = 23
liczba neutronów = 13 + 12 = 25