It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. These condensers use tubes that are usually made of stainless steel, copper alloys, or titanium depending on several selection criteria (such as thermal conductivity or corrosion resistance). Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor. Major advantage of lead shield is in its compactness due to its higher density. Under standard conditions, it is the lightest metal and the lightest solid element. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. atomic mass = 1stisotope 62.93 u ×0.692 + 2ndisotope 64.93 u × 0.308. avg. The name samarium is after the mineral samarskite from which it was isolated. Because of its high chemical reactivity, barium is never found in nature as a free element. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. The chemical symbol for Radon is Rn. Neutron number is rarely written explicitly in nuclide symbol notation, but appears as a subscript to the right of the element symbol. Symbol: Cu. It is occasionally found in native form as elemental crystals. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. Iron is a metal in the first transition series. The chemical symbol for Tellurium is Te. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. It is the heaviest essential mineral nutrient. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). The chemical symbol for Rhenium is Re. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. The Standard English unit is pounds mass per cubic foot (lbm/ft3). Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. The chemical symbol for Radium is Ra. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. 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. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. 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. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. It is composed of two isotopes, Cu-63 and Cu-65, with atomic masses of 62.930 and 64.928 respectively. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. The chemical symbol for Copper is Cu. The atomic mass is the mass of an atom. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. 1) You may use almost everything for non-commercial and educational use.