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.
The U.S. Postal Service is the only mail carrier in the country, and new recruits usually do not have much experience in mail delivery. In response to this, the USPS requires job candidates for most postal positions to pass an entry examination. The examination, known as Test 473, is required for those interested in positions as a city carrier, mail handler, mail processing clerk or in sales and distribution.