That is 1 CE = 1 AD, and 2016 CE = 2016 AD. The word common simply means that it is based on the most frequently used calendar system: the Gregorian Calendar. Both measure the number of years before the approximate birthday of Yeshua/Jesus. Designation of a particular year in BC and BCE also have identical values.
Francium is a chemical element with symbol Fr and atomic number 87. It was formerly known as eka-caesium and actinium K. It is the second-least electronegative element, behind only caesium. Francium is a highly radioactive metal that decays into astatine, radium, and radon. As an alkali metal, it has one valence electron. Bulk francium has never been viewed.
An alpha particle is made up of two protons and two neutrons bound together, which is the equivalent of a helium-4 nucleus. In the process of emitting the alpha particle, the americium-241 atom becomes a neptunium-237 atom.or americium-241, it is known that half of the atoms decay in 458 years. Therefore, 458 years is the half-life of americium-241.