Isotope

Science / Geology / Isotope: One of several forms of one element, all having the same number of protons in the nucleus, but differing in their number of neutrons and thus atomic weight.
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Isotope Geology

Science / Geology / Isotope Geology: The study of the relative abundances of isotopes in rocks to determine their ages (see geo-chronology) or conditions of formation. MORE

Isotopes

Science / Biology / Isotopes: Atoms with the same atomic number but different numbers of neutrons; indicated by adding the mass number to the elements name, e.g., carbon 12 or 12C. MORE

Radioisotope

Science / Biology / Radioisotope: Term applied to a radioactive isotope, such as carbon-14 or uranium 238. Radioisotope nuclei are unstable and spontaneously breakdown and emit one of a number of types of radiation. MORE

Rhenium (Re)

Science / Periodic Table of Elements / Rhenium (Re): Atomic number: 75, Atomic mass: 186.23 g.mol -1, Electronegativity: 1.9, Density: 20.5 g.cm-3 at 20°C, Melting point: 3170 °C, Boiling point: 5627 °C, Vanderwaals radius: 0.138 nm, Ionic radius: un MORE

Rhodium (Rh)

Science / Periodic Table of Elements / Rhodium (Rh): Atomic number: 45, Atomic mass: 102.91 g.mol -1, Electronegativity: 2.2, Density: 12.4 g.cm-3 at 20°C, Melting point: 1970 °C, Boiling point: 3727 °C, Isotopes: 9, Electronic shell: [ Kr ] 4d8 5s1, MORE

Nitrogen (N)

Science / Periodic Table of Elements / Nitrogen (N): Atomic number: 7, Atomic mass: 14.0067 g.mol -1, Electronegativity: 3.0, Density: 1.25*10-3 g.cm-3 at 20°C, Melting point: -210 °C, Boiling point: -195.8 °C, Vanderwaals radius: 0.092 nm, Ionic rad MORE