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.
Applicants to the U.S. Postal Service are usually required to take at least one of several pre-employment exams to assess their aptitude for the position. The most common exam, Exam 473 for mail handlers and mail carriers, is now taken using computers. It is offered both online and in proctored test-taking settings.