He - Gas mulia, periode 1, Ne - Nomor atom 10, Ar - Gas mulia, periode 3, C - Nonlogam, periode 2, P - Nomor atom 15, Si - Metaloid, golongan 14 (IV A), Cu - Golongan transisi, nomor atom 29, Ag - Logam, golongan 11, Au - Logam mulia, periode 6, S  - Nonlogam, golongan 16 (VI A),

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