October 2018 2 11 Report
Suatu spesi memiliki 25 proton, 30 neutron, dan 25 elektron. nomor atom dan nomor massa spesi tersebut berturut turut adalah...
a. 25 dan 30
b. 25 dan 55
c. 30 dan 25
d. 50 dan 30
e. 30 dan 50

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