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A= masa atómica
n= neutrones
A= n+z
z=A-n
z=28-14
z=14
Hay 14 protones y el número atómico es 14
A=28
Z= numero atomico
z =p=e
N=A+Z
Z= A-Z
Z= 28-14=14 PROTONES 14 ELECTRONES 14 Neutrones=14 Numero Atomico =14