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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). Major advantage of lead shield is in its compactness due to its higher density. Iron, 26 protons, 24 electrons, and 32 neutrons. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. The chemical symbol for Holmium is Ho. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. The chemical symbol for Plutonium is Pu. What mass of your element = 1 mol? Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). The number of electrons in a neutral atom is equal to the number of protons. Where more than one isotope exists, the value given is the abundance weighted average. The chemical symbol for Rubidium is Rb. The chemical symbol for Astatine is At. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths. Rhodium is a chemical element with atomic number 45 which means there are 45 protons and 45 electrons in the atomic structure. Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure. It is a soft, silvery-white alkali metal. The chemical symbol for Astatine is At. Uranium has the highest atomic weight of the primordially occurring elements. It is fairly soft and slowly tarnishes in air. The chemical symbol for Beryllium is Be. Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. A freshly exposed surface of pure copper has a reddish-orange color. Origin of Name: From the English word potash, meaning pot ashes, and the Arabic word qali, meaning alkali.The symbol K comes from the Latin word kalium, meaning alkali. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. Astatine-211 releases alpha particles as it decays, radioactive barbs made up of protons and neutrons that can kill cancer cells.    Boiling Point Zirconium is widely used as a cladding for nuclear reactor fuels. Arsenic is a metalloid. The chemical symbol for Erbium is Er. Nickel is a silvery-white lustrous metal with a slight golden tinge. Carbon is one of the few elements known since antiquity. Astatine is isolated also by Emilio Segrè also in 1940 at the University of California, Berkeley. 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. And 27 electrons in the atomic structure and 10B ( astatine protons neutrons electrons % ) and radioactive only be produced in accelerators... 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