ac·ti·non 
(ăktə-nŏn′)
(ăktə-nŏn′)n.
A radioactive isotope of radon, Rn-219, having a half-life of 3.96 seconds and produced by the disintegration of actinium.
[ACTIN(IUM) + -ON2.]
- William Motter
- William of
- William of
- William of Malmesbury
- "William of Orange."
- William of Orange
- William Orville
- William Penn Adair
- William Randolph
- "William Rufus."
- Williams
- Williams
- Williams
- Williams
- Williams
- Williams
- Williams
- Williams
- Williams
- William Samuel
- Williamsburg
- William Schwenck
- William Seward
- William Seward
- William Smith