Noble Gases
Yes they have full energy levels,this makes them stable.They are highly unreactive, to add on that ionisation is very high in noble gases.
All of the Noble Gases, which are on the right side of the periodic table, have a full outer energy level. The elements that are Noble Gases are the following: Neon Argon Krypton Xenon Radon Ununoctium
Noble gases are the gases in the rightmost column of the Periodic Table that have a full outer energy level. This is why the noble gases do not react with other elements readily. When an atom has a full outer energy level, it means that it has the maximum number of electrons in these outer shells, making it stable.
Nonmetals almost have a full outer energy level while metals have few electrons in their outer energy level.
The column on the periodic table that contains elements with completely filled outer energy levels is the noble gases column (group 18 or Group 8A). These elements have a full outermost energy level, making them stable and less likely to form bonds with other elements.
STUDY
If the outer energy level of an atom is already filled with electrons, it is less likely to react because atoms tend to be more stable when their outer energy levels are full. This full outer level signifies that the atom has achieved a more stable electron configuration (usually the octet rule for most elements).
The valence shell (outermost energy level) of a noble gas is filled in ... ns2 np6 electron configuration except helium where it is 1s2.
8, with the exception of helium which has 2.
the noble gases, in row 18
The ground state of Oxygen contains only eight electrons in only the first two energy levels.
The inert or noble gases have a stable full outer shell of electrons which is why they are so unreactive.