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Thallium: properties of free atoms. Thallium atoms have 81 electrons and the shell structure is 2.8.18.32.18.3. The ground state electron configuration of ground state gaseous neutral thallium is [ Xe ]. 4f 14. 5d 10. 6s 2. 6p 1 and the term symbol is 2 P 1/2.hallium atoms have 81 electrons and the shell structure is 2.8.18.32.18.3.
About Thallium. Thallium is the heaviest member of Group 13 on the periodic table, a family that consists of the post-transition âpoor metals.â The element is a metal that has a low melting point and is extremely malleable, soft enough to be cut with a knife.he Thallium atom has a radius of 170.pm and its Van der Waals radius is 196.pm. In its elemental form, CAS 7440-28-0, thallium has a silvery white appearance. Thallium was first discovered by Sir William Crookes in 1861 and gets its name from the Greek word thallos which means twig or green shoot.