Helium

Science / Chemistry / Helium: Element 2, atomic weight 4.0026. A colorless, odorless, inert gas, first discovered in the emission spectrum of the sun in 1868.

Helium (He)

Science / Periodic Table of Elements / Helium (He): Atomic number: 2, Atomic mass: 4.00260 g.mol -1, Electronegativity: unknown, Density: 0.178*10 -3 g.cm -3 at 20 °C, Melting point: - 272.2 (26 atm) °C, Boiling point: - 268.9 °C, Vanderwaals radius MORE

Berkelium (Bk)

Science / Periodic Table of Elements / Berkelium (Bk): Atomic number: 97, Atomic mass: (247) g.mol -1, Electronegativity: unknown, Density: 14 g.cm3 at 20°C, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: unkno MORE

Californium (Cf)

Science / Periodic Table of Elements / Californium (Cf): Atomic number: 98, Atomic mass: (251) g.mol -1, Electronegativity accordin to Pauling: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic rad MORE

Curium (Cm)

Science / Periodic Table of Elements / Curium (Cm): Atomic number: 96, Atomic mass: (247) g.mol -1, Electronegativity: unknown, Density: 13.51 g.cm-3 at 20°C, Melting point: 1340 °C, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: MORE

Dehiscence

Health / Dentistry / Dehiscence: (a)Implant Dehiscence, a splitting open, a break in the covering epithelium leaving an isolated area of an implant exposed to the oral cavity. (b)Mandibular Dehiscence, exposure of inferior alveolar n MORE

Oxygen (O)

Science / Periodic Table of Elements / Oxygen (O): Atomic number: 8, Atomic mass: 15.999 g.mol -1, Electronegativity: 3.5, Density: 1.429 kg/m3 at 20°C, Melting point: -219 °C, Boiling point: -183 °C, Vanderwaals radius: 0.074 nm, Ionic radius: 0.1 MORE

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