Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. What is Uranium in the Environment - Definition, What is Quark in the Standard Model - Definition, What is Electron in the Standard Model - Definition. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. Can asphyxiate. Chemically, indium is similar to gallium and thallium. [168] However, the high-frequency-preferred amplification causes a change in timbre of the amplified sound, resulting in a reedy, duck-like vocal quality. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. Note that, these points are associated with the standard atmospheric pressure. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. Below 2.18 K, thermal conductivity of helium-4 becomes more than 1,000 times greater than that of copper . The chemical symbol for Scandium is Sc. Its name is derived from the Greek word “Helios” meaning Sun. Helium is a commonly used carrier gas for gas chromatography. The chemical symbol for Titanium is Ti. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. View Answer. Nickel is a chemical element with atomic number 28 which means there are 28 protons and 28 electrons in the atomic structure. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. When a person speaks after inhaling helium gas, the muscles that control the voice box still move in the same way as when the voice box is filled with air, therefore the fundamental frequency (sometimes called pitch) produced by direct vibration of the vocal folds does not change. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. The chemical symbol for Lanthanum is La. The chemical symbol for Chromium is Cr. In nuclear reactors, promethium equilibrium exists in power operation. Thallium is a soft gray post-transition metal is not found free in nature. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. These condensers use tubes that are usually made of stainless steel, copper alloys, or titanium depending on several selection criteria (such as thermal conductivity or corrosion resistance). Helium appears as a colorless, odorless, noncombustible gas. [160], The use of helium reduces the distorting effects of temperature variations in the space between lenses in some telescopes, due to its extremely low index of refraction. Helium does not freeze at atmospheric pressure. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. [89], At high pressures (more than about 20 atm or two MPa), a mixture of helium and oxygen (heliox) can lead to high-pressure nervous syndrome, a sort of reverse-anesthetic effect; adding a small amount of nitrogen to the mixture can alleviate the problem. Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium). [24][167] This increase in the resonant frequency of the amplifier (the vocal tract) gives an increased amplification to the high-frequency components of the sound wave produced by the direct vibration of the vocal folds, compared to the case when the voice box is filled with air. [156] This effect may be countered to some extent by adding an amount of narcotic gas such as hydrogen or nitrogen to a helium–oxygen mixture. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys. Helium has the lowest boiling point of all the elements. [172][173][174] Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. The speed of sound in helium is nearly three times the speed of sound in air. The chemical symbol for Rhenium is Re. Any addition of thermal energy results in a phase transition. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese. Helium is the 2nd lightest element on the periodic table. It is present at about 24% of the total elemental ma… It is the heaviest essential mineral nutrient. Titanium is a lustrous transition metal with a silver color, low density, and high strength. Containers of helium gas at 5 to 10 K should be handled as if they contain liquid helium due to the rapid and significant thermal expansion that occurs when helium gas at less than 10 K is warmed to room temperature. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. The chemical symbol for Rubidium is Rb. By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. In fact their absorption cross-sections are the highest among all stable isotopes. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. See: "Noble Gases". The chemical symbol for Fermium is Fm. Boiling point of Helium is -268.9°C. Due to a lower gas density of helium, it helps to flush out nitrogen and even oxygen, which can have drastic effects below 60-70 ft of water. For example, the Saturn V rocket used in the Apollo program needed about 370,000 m3 (13 million cubic feet) of helium to launch. Francium is an alkali metal, that has one valence electron. Neptunium is the first transuranic element. Physics Today web site", https://en.wikipedia.org/w/index.php?title=Helium&oldid=1003426518, Wikipedia indefinitely semi-protected pages, Short description is different from Wikidata, Instances of Lang-el using second unnamed parameter, Articles containing potentially dated statements from 2012, All articles containing potentially dated statements, Articles needing additional references from August 2020, All articles needing additional references, Articles containing potentially dated statements from 2011, Articles with unsourced statements from November 2020, Creative Commons Attribution-ShareAlike License, colorless gas, exhibiting a gray, cloudy glow (or reddish-orange if an especially high voltage is used) when placed in an electric field. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. Lead is a heavy metal that is denser than most common materials. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars. Helium – Melting Point. MEDIUM. Technological Application. In nuclear industry gadolinium is commonly used as a neutron absorber due to very high neutron absorbtion cross-section of two isotopes 155Gd and 157Gd. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. It has a thermal conductivity that is greater than any g… Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps. While hydrogen gas is more buoyant, and escapes permeating through a membrane at a lower rate, helium has the advantage of being non-flammable, and indeed fire-retardant. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. Neptunium metal is silvery and tarnishes when exposed to air. (Biman B. Nath. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. The new gas obtained from uraninite [ 150 ], helium is a chemical element the! 26 which means there are 96 protons and 90 electrons in the atomic structure traditionally considered be. For sulfur is a soft gray post-transition metal and one of the stable halogens, being sixty-first. 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