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Fluor F 18,9≈19 9 10
Sodio Na 22,9≈23 11 12
Mercurio Hg 200,5 ≈201 80 121
Francio Fr 223 87 136
Argon Ar 39,9≈40 18 22
Neutrones = Masa atómica - Número atómico
N = A - Z
porfa, calificame...gracias