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.
Entitled Harlem: Mecca of the New Negro, the special issue's publication in March 1925âand its expansion later that year into a book, The New Negro: An Interpretation âhelped to launch the careers of writers Countee Cullen, Zora Neale Hurston, Claude McKay, and Langston Hughes, as well as artist Aaron Douglas.