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z = 8
m = 16, 17,18
igual z diferente m por lo tanto son isotopos(igual número atómico)
2)Cloro
z = 17
m = 36, 37, 36
cloro tiene 3 isótopos(igual z diferente peso atómico
3)Azufre
2 isotopos S 32 y S 33.