Electronic Structure Problem!

[ruby_duby]

hi this question is to do with electronic structure.
What is special about the arrangement of helium, neon and argon?
Please help because i really dont know! :smile:

[Gokul43201]

Look at the configurations for all the Noble Gases, by clicking below, and see if you find a pattern :

helium (http://www.webelements.com/webelements/elements/text/He/econ.html)
neon (http://www.webelements.com/webelements/elements/text/Ne/econ.html)
argon (http://www.webelements.com/webelements/elements/text/Ar/econ.html)
krypton (http://www.webelements.com/webelements/elements/text/Kr/econ.html)
xenon (http://www.webelements.com/webelements/elements/text/Xe/econ.html)