February 2019 1 14 Report
Diketahui beberapa unsur 11`A, 15`B, 17`C dan 20`D unsur-unsur yang cenderung mencapai kestabilan dengan melepas elektron valensi adalah.....
a. A dan B
b. B dan C
c. A dan C
d. A dan D
e. C dan D
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