Their uses depend on their inertness, low density and non-flammability. At normal temperature and pressure, they are colorless and odorless monoatomic gases, making it difficult to carry out chemical reactions. Noble gases are a gas composed of Group 0 elements on the periodic table. Disproving Beliefs about the Noble Gases Scientists had always believed that noble gases, also known as inert or rare gases, were chemically unable to react. That non-reactivity is why they are called inert. They show trends in their physical properties. Their inertness to chemical reactivity is due to the following reasons. Answered November 14, 2017 Neon gas is least reactive. Actually noble gases are least reactive but among all neon is least reactive. If you look at a periodic table, you see that these numbers correspond to the right hand side -- the noble gases -- these are very NOT reactive. Elements react with one another to gain a full complement of electrons like the noble gases. These are helium, neon, argon, krypton, xenon and radioactive radon. ii) They have high ionization enthalpy. However, just as a nobleman can be pushed into … i) The noble gases .except helium (1s2) have completely filled ns2np6 electronic configuration in their valence shell. Noble gases are a type of inert gas. Meet Theo Gray, chemist and author, who helps David explore how the electron configuration of an atom affects its ability to combine with other atoms. At the top of the noble gases is little helium (He), with a shell that is full with only two electrons. Typically, no, noble gases are not reactive. Metals are malleable and ductile. Noble gases, most often found as monatomic gases, have completely filled outer electron shells, so have no inclination to react with other elements, thus very rarely forming compounds with other elements. Not sure about the last one, look it up, this sounds like homework to me, check your notes or your book. In fact, they rarely combine with other elements. They have a stable number of electrons and do not need to react with other atoms. iii) They have more positive electron gain enthalpy. Gases are found as reactive gases and inert gases. List of Reactive and Non-Reactive Gases Seymour Lee December 03, 2020 15:09. Noble gases have a full valence shell, so they do not react with other elements. All of the noble gases, except for helium, contain eight electrons in their outermost energy levels. The group 0 elements, the noble gases, are all unreactive non-metal gases. The main difference between inert gases and noble gases is that inert gases do not undergo chemical reactions whereas noble gases can undergo chemical reactions at certain conditions. Noble gases are unreactive because they have the full complement of electrons in their outermost energy levels. However, Xenon has been shown to react with the incredibly electro-negative fluorine. 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