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May 23, 2020 · Learn what noble gases are, which elements are included in the group, and what properties distinguish a noble gas from other element of the periodic table.
The noble gases—including helium—can form stable molecular ions in the gas phase. The simplest is the helium hydride molecular ion, HeH +, discovered in 1925.
- VIIIA
- helium group orneon group
- 4.20-4.90
- noble gases
Jun 28, 2024 · noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og). The noble gases are colourless, odourless, tasteless, nonflammable gases.
Apr 28, 2023 · At any particular temperature, we define the standard state of any liquid or solid substance to be the most stable form of that substance at a pressure of one bar. For example, for water at \(-10\) C, the standard state is ice at a pressure of one bar; at \(+10\) C, it is liquid water at a pressure of one bar.
Jun 28, 2024 · Only krypton, xenon, and radon are known to form stable compounds. The compounds of these noble gases are powerful oxidizing agents (substances that tend to remove electrons from others) and have potential value as reagents in the synthesis of other chemical compounds .
Under standard conditions for temperature and pressure, all the noble gases exist in the gaseous phase. They are known to possess extremely low chemical reactivity (hence the name inert gas). This is because all the noble gases have stable electronic configurations. This is the reason why noble gases do not form molecules easily and are mostly ...
Jul 4, 2024 · Gas, one of the three fundamental states of matter, with distinctly different properties from the liquid and solid states. The remarkable feature of gases is that they appear to have no structure at all. They have neither a definite size nor shape, whereas ordinary solids have both a definite size.
