1) The relationship between hydrogen ions and time according to Arrhenius. a) b) c) d) 2) what is the number of elements in the periodic table a) 111 b) 114 c) 118 d) 120 3) what is the valency of iron? a) 2 b) 3 c) 6 d) all of above 4) which one of them is gas? a) HCl b) CO2 c) NH4OH d) NaCl 5) which one of them is non metal? a) Na b) K c) Ca d) Br

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