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Neon is a colorless, odorless, inert monatomic gas under standard conditions, with approximately two-thirds the density of air. Neon was discovered in 1898 alongside krypton and xenon, identified as one of the three remaining rare inert elements in dry air after the removal of nitrogen, oxygen, argon, and carbon dioxide.
The noble gases (historically the inert gases, sometimes referred to as aerogens [1]) ... In 1898, he discovered the elements krypton, neon, and xenon, ...
The noble gases (helium, neon, argon, krypton, xenon and radon) were previously known as 'inert gases' because of their perceived lack of participation in any chemical reactions. The reason for this is that their outermost electron shells (valence shells) are completely filled, so that they have little tendency to gain or lose electrons.
The term inert gas is context-dependent because several of the inert gases, including nitrogen and carbon dioxide, can be made to react under certain conditions. [1] [2] Purified argon gas is the most commonly used inert gas due to its high natural abundance (78.3% N 2, 1% Ar in air) [3] and low relative cost.
The compound [Xe 2] + [Sb 4 F 21] − contains a Xe–Xe bond, which is the longest element-element bond known (308.71 pm = 3.0871 Å). [14] Short-lived excimers of Xe 2 are reported to exist as a part of the function of excimer lasers. [citation needed]
While these elements have been described historically as completely inert, chemical compounds have been synthesized with all but neon and helium. [ 3 ] When grouped together with the homonuclear diatomic gases such as nitrogen (N 2 ), the noble gases are called "elemental gases" to distinguish them from molecules that are also chemical compounds .
The popular college football matchup is known for its innovative elements — like last year's edible mascot that was, in fact, eaten by the champions at the end of the 2023 game.
The noble gases helium, neon, argon, krypton, xenon are nonreactive and have no known direct biological role — albeit xenon nevertheless very surprisingly exhibits both anesthetic and neuroprotective side-effects despite usually being considered "chemically inert," and can activate at least one human transcription factor. (Radon is ...