Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. The chemical symbol for Terbium is Tb. The chemical symbol for Iron is Fe. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. The chemical symbol for Barium is Ba. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. Damit Verizon Media und unsere Partner Ihre personenbezogenen Daten verarbeiten können, wählen Sie bitte 'Ich stimme zu.' 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. The chemical symbol for Cerium is Ce. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. Tellurium is chemically related to selenium and sulfur. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. Chemically, indium is similar to gallium and thallium. The chemical symbol for Silicon is Si. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. If you continue to use this site we will assume that you are happy with it. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. Thulium is the thirteenth and third-last element in the lanthanide series. The chemical symbol for Promethium is Pm. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. The chemical symbol for Polonium is Po. The chemical symbol for Curium is Cm. For example, the neutron number of uranium-238 is 238-92=146. It is an intensive property, which is mathematically defined as mass divided by volume: In words, the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. Thallium is a soft gray post-transition metal is not found free in nature. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. The chemical symbol for Osmium is Os. The chemical symbol for Xenon is Xe. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. The chemical symbol for Titanium is Ti. The unit of measure for mass is the atomic mass unit (amu). The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. Only about 5×10−8% of all matter in the universe is europium. 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. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 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. The Cookies Statement is part of our Privacy Policy. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure.