Helium has 2 electrons in its S shell. The most electrons that an S shell can hold is 2 so helium has a full shell, this is why it is sometimes grouped with the noble gas' as they all display full...
All of the Noble Gases (Group 8 of the Periodic Table) These are - Helium Neon Argon Krypton Xenon Radon (Possibly Hydrogen) Why? Because they are very stable elements. Which means that they have the...