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Sagot :

LEAFE

a)

  • ₅¹¹B
  • ₁₉³⁹K
  • ₈₈²²⁶Ra

b)

  • A = 3+4 = 7 = ⁷Li
  • A = 32 + 42 = 74 = ⁷⁴Ge
  • A = 87 + 136 = 223 = ²²³Fr

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