![]() ![]() Until recently, bismuth was considered the heaviest element that still had a stable nucleus. It also has a particularly low melting point, which enables it to form alloys that can be used for molds, fire detectors and fire extinguishers. In fact, bismuth's electric and thermal conductivity is unusually low for a metal. Post-transition metals share some characteristics of transition metals but are softer and conduct more poorly. ![]() (Different versions of the periodic table represent it as a transition metal.) Transition metals - the largest group of elements, which includes copper, lead, iron, zinc and gold - are very hard, with high melting points and boiling points. ![]() Bismuth, element 83 on the periodic table of elements, is a post-transition metal, according to Los Alamos National Laboratory. ![]()
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