The chemical symbol for Lawrencium is Lr. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. On the atomic scale, physicists have found that quantum mechanics describes things very well on that scale. Discoverer: Corson, Dale R. and Mackenzie, K. R. The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. The atomic number for krypton is 36. The chemical symbol for Mendelevium is Md. Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. 30 - 2 = 28 electrons In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. The Cookies Statement is part of our Privacy Policy. Hafniumâs large neutron capture cross-section makes it a good material for neutron absorption in control rods in nuclear power plants, but at the same time requires that it be removed from the neutron-transparent corrosion-resistant zirconium alloys used in nuclear reactors. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. Become a Study.com member to unlock this Rhodium is a chemical element with atomic number 45 which means there are 45 protons and 45 electrons in the atomic structure. The most stable known isotope, 269Hs, has a half-life of approximately 9.7 seconds. The other inert gases including argon and xenon also have full outer shells with eight electrons. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. The chemical symbol for Niobium is Nb. Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. It must be noted, atoms lack a well-defined outer boundary. In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. Silver is a chemical element with atomic number 47 which means there are 47 protons and 47 electrons in the atomic structure. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. These electrons together weigh only a fraction (let say 0.05%) of entire atom.  It is a synthetic element (first synthesised at Hasse in Germany) and radioactive. Approximately 60â70% of thallium production is used in the electronics industry. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. It rarely occurs in its elemental state or as pure ore compounds in the Earthâs crust. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. The chemical symbol for Palladium is Pd. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. Iron is a metal in the first transition series. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. As a result, the electron cloud contracts and the atomic radius decreases. Arsenic is a metalloid. It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden. protons + neutrons). Melting point of Krypton is -156,6 °C and its the boiling point is -152,3 °C. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. Take for instance your krypton-84: The number on top tells you how many nucleons (protons + neutrons) you have (this usually, also adds up to the molar mass of this specific isotope). The atomic radius of a chemical element is a measure of the distance out to which the electron cloud extends from the nucleus. Titanium condenser tubes are usually the best technical choice, however titanium is very expensive material. The chemical symbol for Lanthanum is La. Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium) and columbite. 1) You may use almost everything for non-commercial and educational use. Francium is a highly radioactive metal that decays into astatine, radium, and radon. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. What are some common mistakes students make with isotope notation? The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. 68 protons and 49 electrons in the lanthanide series and is found in the electronics industry since krypton is chemical... 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