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 take proctored 473 Postal Exams and other related post office exams at designated testing facilities on computers instead of lengthy written tests. This site, along with our Post Office Jobs study guide, features the Postal Service's recruiting programs.