Add single electrons and/or electron pairs as needed to complete the electron-dot symbol for astatine.

So in your question where as ask to add single electrons and / or electron pairs as needed to complete the electron-dot symbol for astatine, base on my research and calculation the nest answer would be just add one dot of electron in the regular symbol or figure of astatine and the electron configuration of it is 4f14 5d 10 6s 2 6p 5