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elektron: 56-2= 54
neutron: 137-56= 81
2. proton : 30
elektron : 28
neutron : 35
3. proton : 35
elektron : 36
neutron : 45
kalo gak salah
Zn^2+ ⇒ p: 30, e: 28, n: 35
Br^- ⇒ p: 35, e: 36, n: 45