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a. nomor massa: 24
b. nomor atom: 12
c. proton: 12
d. elektron: 12 - 2 = 10
e. neutron: 24 - 12 = 12
2.68Ga31 3+
a. nomor massa: 68
b. nomor atom: 31
c. proton: 31
d. elektron: 31 - 3 = 28
e. neutron: 68 - 31 = 37
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