Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. The atomic mass is the mass of an atom. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. Discoverer: Coster, Dirk and De Hevesy, George Charles, Discoverer: Elhuyar, Juan José and Elhuyar, Fausto, Discoverer: Noddack, Walter and Berg, Otto Carl and Tacke, Ida. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. The chemical symbol for Europium is Eu. The chemical symbol for Iron is Fe. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. Astatine is the rarest naturally occurring element on the Earth’s crust. One atomic mass unit is equal to 1.66 x 10 -24 grams. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. Typical densities of various substances are at atmospheric pressure. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. Francium is a highly radioactive metal that decays into astatine, radium, and radon. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. The chemical symbol for Actinium is Ac. Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. The unit of measure for mass is the atomic mass unit (amu). Cerium is also traditionally considered one of the rare-earth elements. 2) You may not distribute or commercially exploit the content, especially on another website. Therefore, we cannot determine the neutron number of uranium, for example. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Gold is a transition metal and a group 11 element. Lead is soft and malleable, and has a relatively low melting point. 113Cd has specific absorption cross-section. Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. Niobium is a soft, grey, ductile transition metal, often found in the minerals pyrochlore (the main commercial source for niobium) and columbite. The size and mass of atoms are so small that the use of normal measuring units, while possible, is often inconvenient. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Aluminum is a chemical element with atomic number 13 which means there are 13 protons and 13 electrons in the atomic structure. The chemical symbol for Calcium is Ca. The chemical symbol for Indium is In. The chemical symbol for Neptunium is Np. Terbium is a chemical element with atomic number 65 which means there are 65 protons and 65 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. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese.  The density of Hassium results from its high atomic weight and from the significant decrease in ionic radii of the elements in the lanthanide series, known as lanthanide and actinide contraction. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. The chemical symbol for Boron is B. The chemical symbol for Caesium is Cs. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. According to the Einstein relationship (E=mc2), this binding energy is proportional to this mass difference and it is known as the mass defect. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. The chemical symbol for Aluminum is Al. The chemical symbol for Tellurium is Te. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead.

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