Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Only about 5×10−8% of all matter in the universe is europium. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. The chemical symbol for Rubidium is Rb. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. The chemical symbol for Einsteinium is Es. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. All of its isotopes are radioactive. The chemical symbol for Thulium is Tm. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. The chemical symbol for Boron is B. In fact their absorption cross-sections are the highest among all stable isotopes. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. 4H contains one proton and three neutrons in its nucleus. In fact, it's actually possible to have an atom consisting of only a proton (ionized hydrogen). Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. The chemical symbol for Sodium is Na. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. 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. Nuclear stability is a concept that helps to identify the stability of an isotope. Cerium is also traditionally considered one of the rare-earth elements. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. The most important use of hydrogen in the world is in ammonia manufacture for the fertilizer market. It decays through double neutron emission and has a half-life of at least 9.1 × 10−22 seconds. For example, 63Cu (29 protons and 34 neutrons) has a mass number of 63 and an isotopic mass in its nuclear ground state is 62.91367 u. Wikipedia Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. We can determine the neutron number of certain isotope. Einsteinium is the seventh transuranic element, and an actinide. The chemical symbol for Mendelevium is Md. One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. The other significant use of this chemical element is in fossil fuel processing. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. Its boiling point is the lowest among all the elements. The chemical symbol for Dysprosium is Dy. and Gay-Lussac, L.-J. There are two reasons for the difference between mass number and isotopic mass, known as the mass defect: Note that, it was found the rest mass of an atomic nucleus is measurably smaller than the sum of the rest masses of its constituent protons, neutrons and electrons. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. Its atomic mass is 4.02781 ± 0.00011 amu. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Tellurium is chemically related to selenium and sulfur. Atomic weight of Hydrogen is 1.008 u or g/mol. The chemical symbol for Antimony is Sb. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Boron is a chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. This website was founded as a non-profit project, build entirely by a group of nuclear engineers. The chemical symbol for Radon is Rn. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. The chemical symbol for Polonium is Po. Boundless vets and curates high-quality, openly licensed content from around the Internet. Neptunium metal is silvery and tarnishes when exposed to air. CC BY-SA 3.0. http://en.wikipedia.org/wiki/Hydrogen_isotopes By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. The chemical symbol for Fluorine is F. Fluorine is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. It has been synthesized in the laboratory by bombarding tritium with fast-moving deuterium nuclei. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Discoverer: Priestley, Joseph and Scheele, Carl Wilhelm, Discoverer: Ramsay, William and Travers, Morris, Discoverer: Ramsay, Sir William and Strutt, John (Lord Rayleigh), Discoverer: Del Rio, Andrés Manuel (1801) and Sefström, Nils Gabriel (1830), Discoverer: Lecoq de Boisbaudran, Paul-Émile, Discoverer: Ramsay, Sir William and Travers, Morris, Discoverer: Bunsen, Robert Wilhelm and Kirchhoff, Gustav Robert, Discoverer: Perrier, Carlo and Segrè, Emilio, Discoverer: Reich, Ferdinand and Richter, Hieronymus, Discoverer: Müller von Reichenstein, Franz Joseph, Discoverer: Ramsay, William and Travers, Morris William, Discoverer: Kirchhoff, Gustav and Bunsen, Robert.

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