Thallium (Tl) belongs to the Group 3 - Boron Family of elements. In the new IUPAC grouping, The Boron family is now Group 13.
Page updated 2/25/2016. Carrier, clerk, mail handlers, and distribution associates are required to take and pass the 473 Postal Exam. Other applicants including motor vehicle operators, mechanic, clerical, electronic technician, machinist, and trades must also pass a written test.
Postal Service exams, like test 473, are opened to the public to meet local staffing needs. Entry-level tests examine general aptitude and/or characteristics, not knowledge of facts. The test provides a screening process on job-related criteria for job applicants and allows applicants to compete for positions.