How can we test whether a substance is a metal or a non-metal

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes

Can someone me with questions 12 and 13 plz.