Thallium My element was Thallium. It is atomic number 81. It has 81 protons and electrons and 123 neutrons. Thallium has a mass of 204.3833 atomic mass units. Its symbol is Tl. It resides in Group IIIA of the periodic table. That is the aluminum family. Thallium has a bluish color after exposure to the air. It is a very soft and malleable metal. It has an electron configuration of 1s22s23s23p64s23d104p65s24d105p64f145d106s26p1. It has 6 electron shells. It melts at 576.7 K and boils at 1730 K. It is a solid when at room temperature. Thallium was discovered in 1861 by a British chemist and physicist. His name was Sir William Crookes. He discovered it spectroscopically in England. He isolated it. In 1862, the French chemist Claude August again isolated it. Thallium comes form the Greek word "thallos". "Thallos"....

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