October 2018 1 65 Report
Diketahui atom A mempunyai jumlah proton , neutron , dan elektron berturut-turut 53 , 74 , dan 53 . Atom tersebut mempunyai lambang ...
a. 53
21 A
b. 74
21 A
c. 74
53 A
d. 127
53 A

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