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N= neutrones
A= masa
A= Z+N
A) Z=3
A= Z+N
6= 3+N
3=N
B) z=26
57= 26+ N
31= N
C) z=17
37=17+N
20=N
D) z=9
19=9+N
10=N
E) Z=13
27=13+N
14= N
F) Z=8
16=8+N
8=N