Look at each of the following pairs of elements. predict
whether each pair would form ionic bonds. explain your
reasoning.
(a) mg, o (b) zn, cl (c) c, f (d) h, f

the answer is c. nacl

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a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.