oltingugurt, S, kalsiyning protoni...., 20 ta, elementning bog' hosil qilishi......, Valentlik, kislorodning valentligi, 2 , 1,2,3,4 valentli element, azot, alyuminiy, Al, Na, Natriy, kripton, Kr, bor valentligi, 3, magniy, Mg, brom, Br, kremniy, Si, marganes, Mn, volfram, W.

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