Helium's electron configuration is 1s2. Neon's electron configuration is 1s22s22p6. All of the rest of the noble gases, like neon, have the maximum number of electrons in their outermost s and p...
Yes they do. For abbreviated notation you should not just put the noble gas in brackets and call it done... back it up to the previous noble gas. For instance:
Argon:
1s2 2s2 2p6 3s2 3p6 or [Ne]...