Generally, the more empty the outer electron shell, the more reactive the element. Helium has two(2) electrons, and is thus full, all the other noble elements has eight(8) electrons in it's outer electron shell, so they are also full. *And for everyone's sake, krypton is not green, but colorless, and forms white crystals when solid.
(a) Jubilees was written between 153 B.C. and the year of Hyrcanus' breach with the Pharisees. (1) It was written during the pontificate of the Maccabean family, and not earlier than 155 B.C., when this office was assumed by Jonathan the Maccabee.
The lyrics are contained in the book Rhymes of the Rookies published in 1917. The author of these poems was W.E. Christian. The book is available online in several formats. The book consists of a series of poems regarding military life prior to World War I. Some lyrics were popular phrases before the song was written. The line To the shores of Tripoli  refers to the First Barbary War, and specifically the Battle of Derne in 1805.