Science / Chemistry / Radioactivity: Spontaneous emission of particles or high-energy electromagnetic radiation from the nuclei of unstable atoms. 'Radiation' refers to the emissions, and 'radioactive source' refers to the source of the radiation.
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Science / Periodic Table of Elements / Thorium (Th): Atomic number: 90, Atomic mass: 232.04 g.mol -1, Electronegativity: 1.3, Density: 11.72 g.cm-3 at 20?°C, Melting point: 1750 ?°C, Boiling point: 4790 ?°C, Vanderwaals radius: 0.182 nm, Ionic radius MORE
Science / Periodic Table of Elements / Actinium (Ac): Atomic number: 89, Atomic mass: 227 g.mol -1, Electronegativity: 1.1, Density: 10.07 g.cm-3 at 20?°C, Melting point: 1050 ?°C, Boiling point: 3250 ?°C, Vanderwaals radius: unknown, Ionic radius: un MORE
Science / Periodic Table of Elements / Technetium (Tc): Atomic number: 43, Atomic mass: (99) g.mol -1, Electronegativity: 1.9, Density: 11.5 g.cm-3 at 20?°C, Melting point: 2200 oC, Boiling point: 4877 oC, Vanderwaals radius: 0.128 nm, Isotopes: 9, Electr MORE
Science / Periodic Table of Elements / Dysprosium (Dy): Atomic number: 66, Atomic mass: 162.50 g.mol -1, Electronegativity: 1.2, Density: 8.6 g.cm-3 at 20?°C, Melting point: 1412 ?°C, Boiling point: 2562 ?°C, Vanderwaals radius: unknown, Ionic radius: u MORE
Science / Periodic Table of Elements / Protactinium (Pa): Atomic number: 91, Atomic mass: 231.0359 g.mol -1, Electronegativity: 1.5, Density: 15.37 g.cm-3 at 20?°C, Melting point: 1600 ?°C, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: MORE