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- Noble_gas abstract "The noble gases make a group of chemical elements with similar properties: under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity. The six noble gases that occur naturally are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn).For the first six periods of the periodic table, the noble gases are exactly the members of group 18 of the periodic table.It is possible that due to relativistic effects, the group 14 element flerovium exhibits some noble-gas-like properties, instead of the group 18 element ununoctium. Noble gases are typically highly unreactive except when under particular extreme conditions. The inertness of noble gases makes them very suitable in applications where reactions are not wanted. For example: argon is used in lightbulbs to prevent the hot tungsten filament from oxidizing; also, helium is breathed by deep-sea divers to prevent oxygen and nitrogen toxicity.The properties of the noble gases can be well explained by modern theories of atomic structure: their outer shell of valence electrons is considered to be "full", giving them little tendency to participate in chemical reactions, and it has been possible to prepare only a few hundred noble gas compounds. The melting and boiling points for a given noble gas are close together, differing by less than 10 °C (18 °F); that is, they are liquids over only a small temperature range.Neon, argon, krypton, and xenon are obtained from air in an air separation unit using the methods of liquefaction of gases and fractional distillation. Helium is sourced from natural gas fields which have high concentrations of helium in the natural gas, using cryogenic gas separation techniques, and radon is usually isolated from the radioactive decay of dissolved radium compounds. Noble gases have several important applications in industries such as lighting, welding, and space exploration. A helium-oxygen breathing gas is often used by deep-sea divers at depths of seawater over 55 m (180 ft) to keep the diver from experiencing oxygen toxemia, the lethal effect of high-pressure oxygen, and nitrogen narcosis, the distracting narcotic effect of the nitrogen in air beyond this partial-pressure threshold. After the risks caused by the flammability of hydrogen became apparent, it was replaced with helium in blimps and balloons.".
- Noble_gas thumbnail Helium_spectrum.jpg?width=300.
- Noble_gas wikiPageID "21140".
- Noble_gas wikiPageRevisionID "606464915".
- Noble_gas book "Atomic models".
- Noble_gas book "Noble gases".
- Noble_gas book "Periodic table".
- Noble_gas by "no".
- Noble_gas hasPhotoCollection Noble_gas.
- Noble_gas label "Noble gas".
- Noble_gas lcheading "Gases, Rare".
- Noble_gas onlinebooks "yes".
- Noble_gas portal "Chemistry".
- Noble_gas subject Category:Groups_in_the_periodic_table.
- Noble_gas subject Category:Noble_gases.
- Noble_gas comment "The noble gases make a group of chemical elements with similar properties: under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity.".
- Noble_gas label "Edelgas".
- Noble_gas label "Edelgase".
- Noble_gas label "Gas nobili".
- Noble_gas label "Gases nobles".
- Noble_gas label "Gaz noble".
- Noble_gas label "Gás nobre".
- Noble_gas label "Helowce".
- Noble_gas label "Noble gas".
- Noble_gas label "Благородные газы".
- Noble_gas label "غاز نبيل".
- Noble_gas label "稀有气体".
- Noble_gas label "第18族元素".
- Noble_gas sameAs Inertní_plyn.
- Noble_gas sameAs Edelgase.
- Noble_gas sameAs Ευγενή_αέρια.
- Noble_gas sameAs Gases_nobles.
- Noble_gas sameAs Gas_noble.
- Noble_gas sameAs Gaz_noble.
- Noble_gas sameAs Gas_mulia.
- Noble_gas sameAs Gas_nobili.
- Noble_gas sameAs 第18族元素.
- Noble_gas sameAs 비활성_기체.
- Noble_gas sameAs Edelgas.
- Noble_gas sameAs Helowce.
- Noble_gas sameAs Gás_nobre.
- Noble_gas sameAs m.059gn.
- Noble_gas sameAs Q19609.
- Noble_gas sameAs Q19609.
- Noble_gas wasDerivedFrom Noble_gas?oldid=606464915.
- Noble_gas depiction Helium_spectrum.jpg.
- Noble_gas isPrimaryTopicOf Noble_gas.