Davriy sistemada nechta element bor, 118, 115, 119, 65, Kislorodning valentligi nechaga teng, 1, 2, 3, 4, Davriy sistemada nechta davr bor, 5, 6, 7, 8, Ishqoriy metallar nechanchi guruhda joylashgan, 1, 2, 3, 4, Kislorodda nechta proton bor, 6, 7, 8, 16, bu qaysi asbob, kolba, probirka, stakan, slindr

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