Periodlıq sistemada neshe element bar?, 87, 118, 22, 32, Neshe metall emes bar, 87, 96, 22, 32, Periodlar neshege bolinedi, 2, 3, 4, 5, Neshe metall bar?, 87, 96, 63, 30, Periolıq keste neshinshi jńlń ashıldı, 1869, 1864, 1856, 1907

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