October 2018 1 18 Report
Unsur gas X sebanyak 11,2 L (STP) mempunyai massa 20 gram dan inti atomnya mengandung 22 Neutron ,maka pernyataan berikut yang benar mengenai unsur X adalah
1.Terletak pada periode 4
2.Termasuk golongan gas mulia
3.Konfigurasi Elektron [Ar] 4s2 3d10 4p6
4.Mempunyai nomor atom 18
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