November 2018 1 135 Report
Beberapa unsur A,B,C,D,E mempunyai nomor atom berturut turut 4,11,14,19,17
a. tentukan periode dan golongan unsur unsur tersebut!
b. urutkan unsur unsur tersebut berdasarkan kenaikan afinitas elektron dan jari jari atomnya!
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