December 2018 1 196 Report
Atom unsur X dengan massa atom relatif 31 memiliki 16 neutron. Dalam sistem periodik,unsur X terletak pada...
A. gol. oksigen periode 3
B. gol. halogen periode 5
C. gol gas mulia periode 3
D. gol. alkali periode 4
E.gol. nitrogen periode 3

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