Krypton is a member of group 18 (noble gases) elements. Chlorine is a yellow-green gas at room temperature. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Cerium is the second element in the lanthanide series. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. 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. If we include man made elements, the densest so far is Hassium. Hassium is a chemical element with symbol Hs and atomic number 108. The chemical symbol for Rhenium is Re. The chemical symbol for Thorium is Th. by the observation that the exponent in the mass-dependent fractionation equation may deviate significantly Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. The chemical symbol for Palladium is Pd. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Its extreme rarity in the Earth’s crust, comparable to that of platinum. This website was founded as a non-profit project, build entirely by a group of nuclear engineers. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 electrons in the atomic structure. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. It is an intensive property, which is mathematically defined as mass divided by volume: In words, the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. The chemical symbol for Arsenic is As. Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure. Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. The chemical symbol for Yttrium is Y. Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a “rare-earth element”. The bulk properties of astatine are not known with any certainty. The chemical symbol for Americium is Am. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. Neutron number is rarely written explicitly in nuclide symbol notation, but appears as a subscript to the right of the element symbol. The chemical symbol for Samarium is Sm. However, Atomic mass of Oxygen is 15.9994 u. 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. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure.

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