Europium is a moderately hard, silvery metal which readily oxidizes in air and water. The chemical symbol for Molybdenum is Mo. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. The standard SI unit is kilograms per cubic meter (kg/m3). Electron affinities are more difficult to measure than ionization energies. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. Most materials expand when their temperatures increase. Discussion Forum ›› Physical and chemical properties of Europium. 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. The chemical symbol for Calcium is Ca. The chemical symbol for Germanium is Ge. Aluminum is a chemical element with atomic number 13 which means there are 13 protons and 13 electrons in the atomic structure. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 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. Europium (Eu), chemical element, a rare-earth metal of the lanthanide series of the periodic table. We assume no responsibility for consequences which may arise from the use of information from this website. For this purposes, a dimensionless quantity the Pauling scale, symbol χ, is the most commonly used. Titanium is resistant to corrosion in sea water, aqua regia, and chlorine. A liquid in a partial vacuum has a lower boiling point than when that liquid is at atmospheric pressure. 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. Tungsten is an intrinsically brittle and hard material, making it difficult to work. Lead is soft and malleable, and has a relatively low melting point. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Europium is one of the less abundant rare-earth elements: it is almost as abundant as tin. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. It is the most reactive metal, quickly oxidizing in air and seem like calcium in its reaction with water. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. Iron is a metal in the first transition series. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. To use electron affinities properly, it is essential to keep track of sign. An atom of an element in a compound will have a positive oxidation state if it has had electrons removed. Arsenic is a metalloid. It has the atomic symbol Eu, atomic number 63, and atomic weight 152. Any addition of thermal energy results in a phase transition. The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. For example, sodium chloride  (NaCl) is an ionic compound that consists of a multitude of strong ionic bonds. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. The density is 5.24 grams per cubic centimeter. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. Europium phosphors are used in television tubes to give a bright red colour and as an activator for yttrium-based phosphors.