The chemical symbol for Promethium is Pm. 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). The chemical symbol for Tellurium is Te. Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium) and columbite. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. The chemical symbol for Chlorine is Cl. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. All of its isotopes are radioactive. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium. Gold is a transition metal and a group 11 element. Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. 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. In nuclear industry, especially artificial xenon 135 has a tremendous impact on the operation of a nuclear reactor. The molar mass of an element is its atomic weight (relative atomic mass) on the periodic table in g/mol. Pure radium is silvery-white alkaline earth metal. Actinium is a soft, silvery-white radioactive metal. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins. Nuclear stability is a concept that helps to identify the stability of an isotope. Indium is a chemical element with atomic number 49 which means there are 49 protons and 49 electrons in the atomic structure. Name: Magnesium Symbol: Mg Atomic Number: 12 Atomic Mass: 24.305 amu Melting Point: 650.0 °C (923.15 K, 1202.0 °F) Boiling Point: 1107.0 °C (1380.15 K, 2024.6 °F) Number of Protons/Electrons: 12 Number of Neutrons: 12 Classification: Alkaline Earth Crystal Structure: Hexagonal Density @ 293 K: 1.738 g/cm 3 Color: grayish Atomic Structure According to the Einstein relationship (E=mc2), this binding energy is proportional to this mass difference and it is known as the mass defect. Europium is one of the least abundant elements in the universe. Bromine is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. The chemical symbol for Terbium is Tb. Major advantage of lead shield is in its compactness due to its higher density. Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. The chemical symbol for Iridium is Ir. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. Our Website follows all legal requirements to protect your privacy. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. 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. The chemical symbol for Uranium is U. The chemical symbol for Americium is Am. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. According to the Einstein relationship (E=mc2), this binding energy is proportional to this mass difference and it is known as the mass defect. Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. Tin is a post-transition metal in group 14 of the periodic table. The information contained in this website is for general information purposes only. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. The chemical symbol for Thallium is Tl. Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. The chemical symbol for Cerium is Ce. To determine the stability of an isotope you can use the ratio neutron/proton (N/Z). The chemical symbol for Astatine is At. The chemical symbol for Caesium is Cs. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. The chemical symbol for Sodium is Na. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. Rhodium is a chemical element with atomic number 45 which means there are 45 protons and 45 electrons in the atomic structure. The difference is a measure of the nuclear binding energy which holds the nucleus together. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Holmium is a relatively soft and malleable silvery-white metal. The chemical symbol for Xenon is Xe. Titanium is a lustrous transition metal with a silver color, low density, and high strength. The chemical symbol for Neptunium is Np. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. See also: Atomic Mass Number – Does it conserve in a nuclear reaction? The chemical symbol for Manganese is Mn. 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. The chemical symbol for Ruthenium is Ru. The chemical symbol for Europium is Eu. Discoverer: McMillan, Edwin M. and Abelson, Philip H. Discoverer: Glenn T. Seaborg, Joseph W. Kennedy, Edward M. McMillan, Arthur C. Wohl, Discoverer: Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso, Discoverer: Glenn T. Seaborg, Ralph A. James, Albert Ghiorso, Discoverer: Stanley G. Thompson, Glenn T. Seaborg, Kenneth Street, Jr., Albert Ghiorso, Discoverer: Stanley G. Thompson, Glenn T. Seaborg, Bernard G. Harvey, Gregory R. Choppin, Albert Ghiorso, Discoverer: Albert Ghiorso, Glenn T. Seaborg, Torbørn Sikkeland, John R. Walton, Discoverer: Albert Ghiorso, Torbjørn Sikkeland, Almon E. Larsh, Robert M. Latimer, Copyright 2020 Periodic Table | All Rights Reserved |.