If you are eligible for reinstatement and wish to return to federal service the reinstatement program affords you an advantage other applicants don't have. You will have to locate openings and at a grade at or below the grade you left federal service. The process is straight forward and outlined below.
The period number is an identifier used to describe the row of the standard periodic table in which the element appears. The lanthanoids and actinoids are extensions of Periods 6 and 7 respectively, hence their assignment to those Periods.
Updated October 14, 2016. A serial number is a unique, identifying number or group of numbers and letters assigned to an individual piece of hardware or software. The term serial number is often shortened to just S/N or SN, especially when the word precedes an actual serial number on something.