<Li> Aluminium is generally considered a metal, but it has some metalloid / non-metal properties such as negative oxidation states </Li> <P> Previously called inert gases, their name was changed as there are a few other gases that are inert but not noble gases, such as nitrogen . The noble gases are located in the far right column of the periodic table, also known as group 0 or group 18 . Noble gases are also called as aerogens but this nomenclature of the group is not officially accepted by the IUPAC . </P> <P> All of the noble gases have full outer shells with eight electrons . However, at the top of the noble gases is helium, with a shell that is full with only two electrons . The fact that their outer shells are full means they rarely react with other elements, which led to their original title of "inert". </P> <P> Because of their chemical properties, these gases are also used in the laboratory to help stabilize reactions that would usually proceed too quickly . As the atomic numbers increase, the elements become rarer . </P>

What are the different blocks of elements in periodic table