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no atom Ba=56
jadi protonnya = 56
elektronnya = 56-2=54
neutronnya =no massanya berapa?
Zn 2+
no atom = 30
jadi protonnya = 30
elektronnya = 30-2=28
neutronnya= no masanya brp?
Br
no atomnya = 35
jadi protonnya= 35
elektronnya= 35+1=36
neutronnya= no massanya berapa?