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.
Grammatical number. In linguistics, grammatical number is a grammatical category of nouns, pronouns, and adjective and verb agreement that expresses count distinctions (such as one, two, or three or more). In many languages, including English, the number categories are singular and plural. Some languages also have a dual, trial, quadral and paucal number or other arrangements. The count distinctions typically, but not always, correspond to the actual count of the referents of the marked noun or pronoun.