Giselle is pairing ions to create stable binary ionic compounds. She knows that the sum of charges of the two ions must be zero in order for the compound to be stable. Which ion could be paired with a potassium ion, K+, to form a stable binary compound? beryllium, Be2+
fluorine, F-
oxygen, O2-
lithium, Li+

Is 9 correct? and can someone me with 10? it’s due tomorrow, you

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.

Many free radicals combine to form molecules that do not contain any unpaired electrons. the driving force for the radical–radical combination reaction is the formation of a new electron‑pair bond. consider the chemical equation. n(g)+no(g)⟶nno(g) n(g)+no(g)⟶nno(g) write lewis formulas for the reactant and product species in the chemical equation. include nonbonding electrons. n(g)n(g) select draw rings more erase select draw rings more erase select draw rings more erase n no(g)