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The density of Hassium results from its high atomic weight and from the significant decrease in ionic radii of the elements in the lanthanide series, known as lanthanide and actinide contraction. Specific heat capacity is the amount of energy needed to change the temperature of a kilogram of a substance by 1 K. A measure of the stiffness of a substance. Holmium is a relatively soft and malleable silvery-white metal. [190][157], This article is about the chemical element. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. Physics Today web site", https://en.wikipedia.org/w/index.php?title=Helium&oldid=986563667, 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, 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. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. Group These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Covalent radius Half of the distance between two atoms within a single covalent bond. Returning to the figure of Cl 2 (Figure \(\PageIndex{2}\), we see that the distance AB between two Cl atoms in the same molecule (i.e., the Cl—Cl bond length) has a value of 202 pm.The covalent radius is one-half of this bond length, or 101 pm. Helium has the smallest atomic radius of any element, about 0.2 nanometers. All rights reserved. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. The sum of the oxidation states within a compound or ion must equal the overall charge. It is fairly soft and slowly tarnishes in air. WebElements: THE periodic table on the WWW [www.webelements.com] The chemical symbol for Thallium is Tl. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. The sun is comprised of about 75% by mass of hydrogen and 24% of helium. Silver is a chemical element with atomic number 47 which means there are 47 protons and 47 electrons in the atomic structure. Cerium is the second element in the lanthanide series. The chemical symbol for Germanium is Ge. Helium, 2 He Helium; Pronunciation / ˈ h iː l i ə m / (HEE-lee-əm) Appearance: colorless gas, exhibiting a gray, cloudy glow (or reddish-orange if an especially high voltage is used) when placed in an electric field (Gr. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. In the periodic table, potassium is one of the alkali metals. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. At that time, the stuff was thought to be some sort of Barium compound. Pogson filed his observations of the 1868 eclipse with the local Indian government, but his report wasn't published. However, it was Per Teodor Cleve and Nils Abraham Langer at Uppsala, Sweden, in 1895, who repeated that experiment and confirmed it was helium and measured its atomic weight. The chemical symbol for Astatine is At. Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure. [183], On February 4, 2015 it was revealed that, during the recording of their main TV show on January 28, a 12-year-old member (name withheld) of Japanese all-girl singing group 3B Junior suffered from air embolism, losing consciousness and falling into a coma as a result of air bubbles blocking the flow of blood to the brain, after inhaling huge quantities of helium as part of a game. Preliminary note, part II", "On the occurrence of nitrogen in uraninite and on the composition of uraninite in general,", "On the constitution of atoms and molecules, part I", "On the constitution of atoms and molecules, part II: Systems Containing Only a Single Nucleus", "On the constitution of atoms and molecules, part III: Systems containing several nuclei", Historical Studies in the Physical Sciences, "Stars having peculiar spectra. The Large Hadron Collider at CERN uses 96 metric tons of liquid helium to maintain the temperature at 1.9 K (−271.25 °C; −456.25 °F). Cambridge University's Peter Wothers telling us the tale of element number two, Helium. It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden. Rutherford and Royds in 1907demonstrated that alpha particles are helium nuclei. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. The major source is natural gas, which can contain up to 7% helium. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. These values were determined using several different methods. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. Electron configuration The most stable known isotope, 269Hs, has a half-life of approximately 9.7 seconds. The RSC maintains this Site for your information, education, communication, and personal entertainment. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. The chemical symbol for Fermium is Fm. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Because of its low density helium is often used to fill decorative balloons, weather balloons and airships. Tungsten is an intrinsically brittle and hard material, making it difficult to work. It was, and is still being, formed from alpha-particle decay of radioactive elements in the Earth. Therefore, there are various non-equivalent definitions of atomic radius. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. "Uranium and Helium in the Panhandle Gas Field Texas, and Adjacent Areas", Geological Survey Professional Paper 454-G, Washington:US Government Printing Office.

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