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. The chemical symbol for Fermium is Fm. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. Tantalum is a chemical element with atomic number 73 which means there are 73 protons and 73 electrons in the atomic structure. Atomic weight of Lead is 207.2 u or g/mol. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. The chemical symbol for Lead is Pb. Its extreme rarity in the Earth’s crust, comparable to that of platinum. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. The chemical symbol for Argon is Ar. The chemical symbol for Phosphorus is P. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on Earth. Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. The chemical symbol for Palladium is Pd. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. It is a soft, silvery-white alkali metal. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. The chemical symbol for Bismuth is Bi. The chemical symbol for Thorium is Th. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Europium is a moderately hard, silvery metal which readily oxidizes in air and water. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. The chemical symbol for Dysprosium is Dy. 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 atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. 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. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. The unit of measure for mass is the atomic mass unit (amu). Atomic Number of Lead Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. It is one of the least reactive chemical elements and is solid under standard conditions. The chemical symbol for Neptunium is Np. The chemical symbol for Copper is Cu. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. Pure germanium is a semiconductor with an appearance similar to elemental silicon. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. Titanium condenser tubes are usually the best technical choice, however titanium is very expensive material. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype. The chemical symbol for Indium is In. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. The chemical symbol for Zirconium is Zr. The chemical symbol for Calcium is Ca. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. The chemical symbol for Carbon is C. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. Typical densities of various substances are at atmospheric pressure. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. 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. 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. The chemical symbol for Chlorine is Cl. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. The chemical symbol for Arsenic is As. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). Titanium is a lustrous transition metal with a silver color, low density, and high strength. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Discoverer: Ramsey, Sir William and Cleve, Per Teodor. The chemical symbol for Silver is Ag. Caesium has physical and chemical properties similar to those of rubidium and potassium. It is occasionally found in native form as elemental crystals. If you continue to use this site we will assume that you are happy with it. Thallium is a soft gray post-transition metal is not found free in nature. The chemical symbol for Chromium is Cr. Carbon is one of the few elements known since antiquity. Lawrencium is the final member of the actinide series. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. The chemical symbol for Lutetium is Lu. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. Chlorine is a yellow-green gas at room temperature. 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. Lead is one of the oldest known chemical elements known and used since the times of the Roman Empire. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. The chemical symbol for Lead is Pb . Boiling point of Lead in Kelvin is 2022 K. Lead melting point is 327,5 °C. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals.