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Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

Air can be considered a mixture. which statement does not explain why?