The chemical symbol for Francium is Fr. The chemical symbol for Holmium is Ho. The Cookies Statement is part of our Privacy Policy. 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. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. Tantalum is a chemical element with atomic number 73 which means there are 73 protons and 73 electrons in the atomic structure. Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. Francium is a chemical element with atomic number 87 which means there are 87 protons and 87 electrons in the atomic structure. Chemical symbol for Lead is Pb. Hafnium’s 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. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. © 2019 periodic-table.org / see also 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. Radon is a radioactive, colorless, odorless, tasteless noble gas. The chemical symbol for Argon is Ar. Fermium is a member of the actinide series. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. The chemical symbol for Ytterbium is Yb. The chemical symbol for Samarium is Sm. Arsenic is a metalloid. 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 Lanthanum is La. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. The unit of measure for mass is the atomic mass unit (amu). Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. Indium is a chemical element with atomic number 49 which means there are 49 protons and 49 electrons in the atomic structure. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. The chemical symbol for Dysprosium is Dy. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. In nuclear reactors, promethium equilibrium exists in power operation. Lead is one of the oldest known chemical elements known and used since the times of the Roman Empire.  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. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). The chemical symbol for Arsenic is As. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure. The chemical symbol for Krypton is Kr. The chemical symbol for Plutonium is Pu. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium. Platinum is one of the least reactive metals. Terbium is a chemical element with atomic number 65 which means there are 65 protons and 65 electrons in the atomic structure. The chemical symbol for Mercury is Hg. Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. Lawrencium is the final member of the actinide series. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. Neptunium metal is silvery and tarnishes when exposed to air. The chemical symbol for Astatine is At. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.