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3 periyotta hangi elementler var? İçinde bulundurduğu elementler oksijen (O), kükürt (S), selenyum (Se), tellür (Te), radyoaktif element polonyum (Po) ve yapay element livermoriyumdur (Lv)… 3 periyot 2A grubunda hangi elementler vardır? Periyodik tabloda
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