metalmasslar nechta, 20, 22, 18, 16, kislorodning valentligi, 2, 3, 1, 4, metal elementni toping, F, O, Na, H, bu jihoz nomi, menzurka, shtativ, pipetka, probirka, Davriy sistemani yaratgan olimni korsating, , , , .

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