Why is neon in the same group on the periodic table as helium?

Noble gases: helium, neon, argon, krypton, xenon, and radon. Also known as the rare gases, they once were called inert gases, because scientists believed them incapable of reacting with other elements

They are both noble gases and they both have a full outer shell

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab.