The standard SI unit is kilograms per cubic meter (kg/m3). found in zirconium ore. Hafnium was discovered by the Dutch physicist Dirk Coster and the Hungarian physicist Discovered by: Dirk Coster and George de Hevesy, Electron configuration: [Xe] 4f14 5d2 6s2. All rights reserved. E.g. These variations are overshadowed by larger uncertainties in the value for Ar(Hf), which, Hafnium is a shiny, silvery, ductile metal that is corrosion-resistant and chemically similar to zirconium (due to its having the same number of valence electrons, being in the same group, but also to relativistic effects; the expected expansion of atomic radii from period 5 to 6 is almost exactly cancelled out by the lanthanide contraction). For example, 63Cu (29 protons and 34 neutrons) has a mass number of 63 and an isotopic mass in its nuclear ground state is 62.91367 u. Melting Point: 2150.0 °C (2423.15 K, 3902.0 °F) Boiling Point: 5400.0 °C (5673.15 K, 9752.0 °F) Number of Protons/Electrons: 72. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. Diary store providers multiple free services with 100% confidentiality such as e-Diary, Education, Family & Friends, Inspiration, Health & Beauty and Tour. Hafnium Other elements in the same block: It is successfully alloyed with several metals including iron. The chemical symbol for Hafnium is Hf. Relative atomic mass: 178.49 Electron configuration: [Xe] 4f 14 5d 2 6s 2. 2) You may not distribute or commercially exploit the content, especially on another website. One atomic mass unit is equal to 1.66 x 10-24 grams. Block: d-block. Symbol: Hf. In 1961, the Commission recommended Ar(Hf) = 174.49 based on new mass-spectrometric Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. It is an intensive property, which is mathematically defined as mass divided by volume: In words, the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. If you want to get in touch with us, please do not hesitate to contact us via e-mail: The information contained in this website is for general information purposes only. for 1+3, enter 4. There are two reasons for the difference between mass number and isotopic mass, known as the mass defect: Typical densities of various substances at atmospheric pressure. Hafnium A r (Hf) = 178.486 ± 0.006 since 2019 The name derives from the Latin hafnia for Copenhagen. When hafnium is oxidised, its oxide is used as an electrical insulator. Hafnium is mainly used in preparing of alloys. Atomic Mass of Hafnium Atomic mass of Hafnium is 178.49 u. An element named celtium was erroneously claimed to have been discovered in 1911 by the French chemist Georges Urbain in rare earth samples, until the Danish physicist Niels Bohr, predicted hafnium's properties using his theory of electronic configuration of the elements. However, 176Hf is the principal product of 176Lu decay, Copyright 2020 Nuclear Power for Everybody | All Rights Reserved | Powered by, Interaction of Beta Radiation with Matter, Interaction of Gamma Radiation with Matter, Neodymium – Atomic Number – Atomic Mass – Density of Neodymium, Thallium – Atomic Number – Atomic Mass – Density of Thallium, Reactor Dynamics – Quiz – Test your Knowledge, Grossi highlights IAEA's activities for UN General Assembly, US Senate committee includes uranium reserve in FY2021 allocations, CGN's Hualong One design certified for European use. ISRO PSLV C 3 | Polar Satellite Launch Vehicle. Density is defined as the mass per unit volume. Name: Hafnium. You can know detailed information for each element. of the elements. claimed to have been discovered in 1911 by the French chemist Georges Urbain in rare earth samples, Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. Explore the Possibilities: Study in Singapore! It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. Its atomic number is 72 and represented by the symbol Hf. Number of Neutrons: 106. Ar(Hf) = 178.486 ± 0.006 since 2019 so that small but detectable variations in 176Hf abundance with geologic age and Lu association occur. 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Our Website follows all legal requirements to protect your privacy. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. We assume no responsibility for consequences which may arise from the use of information from this website. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. 32 known isotopes with mass numbers 154 to 185 are present in the Hafnium. Scandium, Titanium, Vanadium, Chromium, Manganese, Iron, Cobalt, Nickel, Copper, Zinc, Yttrium, Zirconium, Niobium, Molybdenum, Technetium, Ruthenium, Rhodium, Palladium, Silver, Cadmium, Lanthanum, Tantalum, Tungsten, Rhenium, Osmium, Iridium, Platinum, Gold, Mercury, Actinium, Rutherfordium, Dubnium, Seaborgium, Bohrium, Hassium, Meitnerium, Darmstadtium, Roentgenium and  Copernicium are the elements in the same block. The minor isotope, 174Hf, is an α-emitter with the very long half-life of 2.0(4)×1015 a. This website does not use any proprietary data. Hafnium changes from its alpha form, a hexagonal close-packed lattice, to its beta form, a body-centered cubic lattice, at 2388 K. The physical properties of hafnium metal samples a… Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. The atomic mass is the mass of an atom. and in 2019 the Commission recommended changes to the standard atomic weight based on recent determinations and evaluations of its isotopic composition.