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Explanation:
2). Lithium <Beryllium <Boron< Carbon< Nitrogen< Oxygen <Fluorine.
3). carbon(C),OXYGEN(O),BERYLLIUM(BE),LITHIUM(LI),NITOGEN(N).
4). the non-metals are present on the UPPER RIGHT side,
group 17: Astatine < Iodine < Bromine < Chlorine < Fluorine