1s22s22p63s23p64s1 - bu qaysi element, K, Ca, Na, Li, Qaysi gaz palag'da tuxim xidli?, H2S, HCl, SO2, NH3, Ftor elementining o'ksidlanish darajasi necha ?, -2, 0, 1, -1, Oddiy moddalarda o'ksidlanish darajasi nechiga teng, 0, 1, Nisbiy elktromanfiyligi eng yuqori element, O2, F, Qaysi metalmas suyuq xolatda?, N2, H2, Br2, He2, P2O3, Fosfor II oksidi, Fosfor V oksidi, Fosforit, Fosfor III oksidi, XVIII asrining oxriga kelib neshta element fanga malum bo'gan, ~25, ~30, 63, 118, Kislorod guruxchasi elimentlari nima deb nomlanadi, Galagenlar, Xalkogenlar, Inert gazlar, Ishqorlar, Yod yetishmasa qaysi kasalik kelib chiqadi, Asab, Anemiya, ko'z nuri susayishi, Asab va buqoq, Inson organizmida uglerod taxminan necha foizni tashkil etadi, 17, 18, 19, 20, Odamda temir yerishmasa qanaqa kasallik kelib chiqadi?, suyak mortligi, allergiya, kamqonlik, qandli diabet, Oktavalar qonuniga kim asos solgan, D. I. Mendeleyev, John Nyulendes, Meyer, Debereyner.
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