Molecular Weight Search Help Search options (step 1) (Back to search) You may search for species based on molecular weight values in two ways: Specify a single value; the system will search for values within 0.5 units of this value. The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z. The chemical symbol for Ytterbium is Yb. Oxygen forms a divalent molecule, so this is the mass of one mole of O 2. Oxygen O 2 32 1.331 1) 1.4292) 0.0831 0.08922) Ozone O 3 48.0 0.125 N-Pentane 72.15 Gas Formula Molecular weight Although classified as a rare earth element, samarium is the 40th most abundant element in the Earth’s crust and is more common than such metals as tin. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) stabilizes the free metal somewhat against further oxidation. Lai ZW(1), Rahim RA, Ariff AB, Mohamad R. Author information: (1)Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia. The molar mass of oxygen is the mass of one mole of oxygen. 10.4k SHARES. The chemical symbol for Bromine is Br. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. The molecular formula of the compound is 1.0k LIKES. 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. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Europium is one of the least abundant elements in the universe. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. The chemical symbol for Radon is Rn. and Gay-Lussac, L.-J. values in two ways: A chemical formula may be entered to restrict the search to The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. Bismuth is a chemical element with atomic number 83 which means there are 83 protons and 83 electrons in the atomic structure. Tellurium is chemically related to selenium and sulfur. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. The densest material found on earth is the metal osmium, but its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. © 2019 periodic-table.org / see also Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars. In nuclear industry, especially artificial xenon 135 has a tremendous impact on the operation of a nuclear reactor. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. The size and mass of atoms are so small that the use of normal measuring units, while possible, is often inconvenient. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. The term mole is often used in place of gram-molecular weight. The chemical symbol for Samarium is Sm. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide. The chemical symbol for Scandium is Sc. Oxygen has a molar mass of 15.9994 g/mol and nitrogen has a molar mass of 14.0067 g/mol. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis. Thorium is moderately hard, malleable, and has a high melting point. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. 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. Oxygen has a molar mass of 15.9994 g/mol and nitrogen has a molar mass of 14.0067 g/mol. Radon is a radioactive, colorless, odorless, tasteless noble gas. The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. 32 g/mol and the molar mass of nitrogen gas is aprox. Nuclides that have the same neutron number but a different proton number are called isotones. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. The atomic weight of elements is a relative figure, with one atom of the carbon-12 isotope being assigned the atomic weight of 12; the atomic weight of hydrogen is then approximately 1, of oxygen approximately 16, and the molecular weight of water (H 2 O) 18. 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). The chemical symbol for Copper is Cu. The chemical symbol for Palladium is Pd. 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. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. Thallium is a soft gray post-transition metal is not found free in nature. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. The chemical symbol for Thulium is Tm. Units of measure have been defined for mass and energy on the atomic scale to make measurements more convenient to express. The chemical symbol for Argon is Ar. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. Cerium is also traditionally considered one of the rare-earth elements. Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. Fermium is a member of the actinide series. the search will be restricted to species which These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Molar mass of O2 = 31.9988 g/mol. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. We use cookies to ensure that we give you the best experience on our website. 2) You may not distribute or commercially exploit the content, especially on another website. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral). It is one of the least reactive chemical elements and is solid under standard conditions. Only about 5×10−8% of all matter in the universe is europium. The chemical symbol for Titanium is Ti. 10.4k VIEWS. The chemical symbol for Calcium is Ca. Specify a range. Select the desired units for thermodynamic data: Specify a single value; the system will search for The molecular weight of oxygen is 32. All of its isotopes are radioactive. Molecular weight: 31.9988 g/mol The difference is a measure of the nuclear binding energy which holds the nucleus together. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. Molecular oxygen (O 2) is a diatomic molecule that is composed of two oxygen atoms held together by a covalent bond. The limits of the range should Carbon is the 15th most abundant element in the Earth’s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. Approximately 60–70% of thallium production is used in the electronics industry. Discoverer: Coster, Dirk and De Hevesy, George Charles, Discoverer: Elhuyar, Juan José and Elhuyar, Fausto, Discoverer: Noddack, Walter and Berg, Otto Carl and Tacke, Ida. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom—the Na+ cation. Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. Chemically, indium is similar to gallium and thallium. The chemical symbol for Promethium is Pm. Convert grams Oxygen to moles or moles Oxygen to grams ›› Percent composition by element The Specific Gravity - SG - is a dimensionless unit defined as the ratio of density of the material to the density of water at a specified temperature. The chemical symbol for Mendelevium is Md. Molecular formula: O 2. In some respects zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn2+ and Mg2+ ions are of similar size. The chemical symbol for Francium is Fr. Definitions of molecular mass, molecular weight, molar mass and molar weight. Discoverer: Davy, Sir H. and Thénard, L.-J. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. Specify a range. We can determine the neutron number of certain isotope. For 12C the atomic mass is exactly 12u, since the atomic mass unit is defined from it. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. 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