necha metallmas bor davriy sistemada, 20, 21, 22, 23, uglerodning kimyoviy belgisi, C, H, Al, S, Davriy sistemada necha davr bor, 6, 7, 8, 9, davriy sistemada necha gurux bor, 7, 9, 8, 10, davriy sistemada necha qotor bor, 10, 11, 12, 13, bu nima ?, probilka , kimyoviy modda , stakan, TJY.

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