September 2018 2 109 Report
1. Atom yang Mempunyai 3 buah kulit dan 5 elektron valensi , massa atomnya 31 . tentukan nomor atomnya , jumlh proton,neutron dan elektron

2.gambarkan rumus struktur dari HCN dan PCL3 , hitung PEI dan PEB nya ( no.atom H=1 , C=6 , N=7 , P= 15 , CI= 17
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