The volume of an atom is about 15 orders of magnitude larger than the volume of a nucleus. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). The Van der Waals radius, rw, of an atom is the radius of an imaginary hard sphere representing the distance of closest approach for another atom. Gas Encyclopedia Argon; Applicable Industries . It has an estimated density of 40.7 x 103 kg/m3. The chemical symbol for Terbium is Tb. Titanium is a lustrous transition metal with a silver color, low density, and high strength. It is often used in filling incandescent light bulbs. Hauptgruppe bzw. Polonium is a rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. A crystal lattice is a repeating pattern of mathematical points that extends throughout space. Since the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance, it is obvious, the density of a substance strongly depends on its atomic mass and also on the atomic number density (N; atoms/cm3). Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. Astatine is the rarest naturally occurring element on the Earth’s crust. 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. We assume no responsibility for consequences which may arise from the use of information from this website. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. Caesium has physical and chemical properties similar to those of rubidium and potassium. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. Specific weight is given as N/m 3 and lb f / ft 3. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Typical densities of various substances are at atmospheric pressure. Rising temperatures make the liquid expand in a liquid-in-tube thermometer and bend bimetallic strips. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Answer. The chemical symbol for Californium is Cf. Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. One atomic mass unit is equal to 1.66 x 10-24 grams. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps. The chemical symbol for Silver is Ag. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. 2009-10-07 08:34:32 2009-10-07 08:34:32 . Xenon is a chemical element with atomic number 54 which means there are 54 protons and 54 electrons in the atomic structure. Related Topics . Uranium is a silvery-white metal in the actinide series of the periodic table. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. al. The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. Abstract: Custody transfer tables are presented for oxygen, argon, nitrogen, helium, and hydrogen. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. Chlorine is a yellow-green gas at room temperature. 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