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 USPS selects the most prepared candidate with the best exam score. Due to the limited experience requirements for postal service hirees, the USPS administers an online exam to screen potential applicants. This exam, the 473E, tests the postal service applicant on the skill set required to be a postal employee. The test is administered only once per applicant, and will be used to evaluate your candidacy for any Postal position for at minimum 4 months. A minimum score of 70 out of 100 is required to be considered.