because the most an atom can have in its outer energy level for electrons is 8
and noble gases have 8 the do not want to react because they want to keep the "octet". reacting means gaining or losing electrons
The noble gases are almost chemically unreactive and they are located in group 18 of the periodic table.
Unreactive
Noble gases are unreactive because their outermost shell, the valence shell, has a full set of eight electrons.
Noble gases do not react chemically with other noble gases.
Helium, Neon, Xenon, Krypton, Radon, and Argon.
Noble gases are usually inert. It is possible, however, to use a noble gas in a compound, such as XeF4, xenon tetrafluoride, but it is not common.
Noble gases have completely filled orbitals, hence they are stable and chemically inert.
The noble gases, column 18 in a wide form periodic table.
The noble gases are almost chemically unreactive and they are located in group 18 of the periodic table.
Unreactive
Krypton is a practically unreactive noble gas.
Correct.
Noble gases have a full valence shell. Reactions often take place in order for an atom to gain a full valence shell and then become chemically unreactive. Since the noble gases already have a full valence shell, they are unreactive (although some exceptions do aply)
Yes. Inert means unreactive, it's the same thing.Commonly you may find questioning this in terms of the octet rule and noble gases, which I wrote an answer to a while back in the following link, if you need to learn more.Why_do_atoms_try_to_have_a_full_octet
Noble gases are chemically inert.
Nobel gases are very unreactive.
Noble gases are unreactive because their outermost shell, the valence shell, has a full set of eight electrons.