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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.
Transcript of Scientists and Their Contribution to Atomic Structure Scientists and Their Contribution to Atomic Structure Start toward the discovery of electrons Discovered thallium Sparked the idea of a fourth state of matter Experiments with cathode tubes led to the discovery of cathode rays (1878) Because of this, he won the Royal Medal (1875) and the Davy Medal (1888), and gained knight-hood (1897)