September 2018 2 121 Report
Tentukan nomor atom unsur berikut.
a. Konfigurasi atom X : 2 8 18 3
b. Atom Y terletak pada golongan IV A periode 5
c. Unsur halogen periode 3
Tentukan jumlah elektron valensi unsur unsur berikur.
a. 5B
b. 14Si
c. 33As
d.49In
e. 84Po

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