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Z=#protones A=#protones + # neutrones
En un átomo neutro se cumple: #protones=#electrones
a) Paladio => Pd Z = 46 A=106
=> protones=46
electrones= 46
A= p+n => n=A-p => si A=106 n=106-46 neutrones= 60
b) Cobalto Z= 27 A=59
p=27
e=27
n=59-27=32
c)Cadmio Z=48 A=112
p=48 e=48 n=112-48= 64
d)Neón Z=10 A=20
p=10 e=10 n=20-10=10