October 2018 1 47 Report
Sebuah atom memiliki jumlah neutron 20 dan proton 19, maka atom tersebut adalah...
a. ²⁰₁₉K
b. ³⁸₁₉K
c. ³⁹₁₉K
d. ³⁹₂₀K
e. ⁴⁰₂₀K

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