Science / Periodic Table of Elements / Hydrogen (H): Atomic number: 1, Atomic mass: 1.007825 g.mol -1, Electronegativity: 2.1, Density: 0.0899*10 -3 g.cm -3 at 20 ?°C, Melting point: - 259.2 ?°C, Boiling point: - 252.8 ?°C, Vanderwaals radius: 0.12 n MORE
Science / Periodic Table of Elements / Ununtrium (Uut): Atomic number: 113, Atomic mass: unknown, Electronegativity acoording to Pauling: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: MORE
Science / Periodic Table of Elements / Ununpentium (Uup): Atomic number: 115, Atomic mass: unknown, Electronegativity acoording to Pauling: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: MORE
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