April 2019 2 19 Report
1. DAlam sistem periodik modern, Unsur ⁸⁶₃₇ X terletak pada periode ke ... golongan ke ...
2. Nomor atom unsur X= 27. Jumlah elektron tidak berpasangan dalam ion X²⁺ adalah...
a. 1
b. 2
c. 3
d. 5
e. 7
3. Bagaimana atom-atom mencapai kestabilan...
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