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 Pledge of Allegiance. The Pledge of Allegiance was written by Francis Bellamy, a Baptist minister and magazine writer for The Youth's Companion. The Pledge was first published in 1892 in The Youth's Companion. It was included in an ad for the Official Programme for the National Columbia Public School Celebration of October 12, 1892, a celebration of the 400 year anniversary of Columbus' discovery of America.