This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. ››More information on molar mass and molecular weight. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. The chemical symbol for Hafnium is Hf. Every particle of matter has some amount of mass associated with it whether small or large. Additionally, the neutron count (neutron number) may then be derived by subtracting the number of protons (atomic number) from the mass number (nucleon count). In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all … For each element the atomic weight is on the periodic table right under the symbol of the … The chemical symbol for Lithium is Li. of a chemical compound, More information on Your email address will not be published. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. Elemental sulfur is a bright yellow crystalline solid at room temperature.   Platinum is one of the least reactive metals. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor. Titanium condenser tubes are usually the best technical choice, however titanium is very expensive material. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. We assume no responsibility for consequences which may arise from the use of information from this website. In nuclear reactors, promethium equilibrium exists in power operation. The configuration of these electrons follows from the principles of quantum mechanics. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. Sodium is a soft, silvery-white, highly reactive metal. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. For each element the atomic weight is on the periodic table right under the symbol of the element. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. The nucleus is composed of protons and neutrons. Twenty years later the primacy of these synonyms was reversed, and the term "relative atomic mass" is now the preferred term. While atomic mass is an absolute mass, relative isotopic mass is a dimensionless number with no units. 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