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Beryllium: (Be) Element 4, atomic weight 9.0122, an extremely toxic metal used as a neutron source and in phosphors.

Beryllium (Be): Atomic number: 4, Atomic mass: 9.01218 g.mol -1, Electronegativity: 1.5, Density: 1.86 g.cm-3, Melting point: 1280 °C, Boiling point: 2970 °C, Vanderwaals radius: unknown, Ionic radius: unkn . . . View Full Definition

Radium (Ra): Atomic number: 88, Atomic mass: 226.0254 g.mol -1, Electronegativity: 0.9, Density: 5 g.cm-3 at 20°C, Melting point: 700 °C, Boiling point: 1140 °C, Vanderwaals radius: 0.230 nm, Ionic radiu . . . View Full Definition

Polonium (Po): Atomic number: 84, Atomic mass: (210) g.mol -1, Electronegativity: 2.0, Density: 9.51 g.cm-3 at 20°C, Melting point: 254 °C, Boiling point: 962 °C, Vanderwaals radius: 0.164 nm, Ionic radius . . . View Full Definition

Calcium (Ca): Atomic number: 20, Atomic mass: 40.08 g.mol -1, Electronegativity: 1.0, Mass volume: 1.6 g.cm-3 at 20°C, Melting point: 840 °C, Boiling point: 1484 °C, Vanderwaals radius: 0.197 nm, Ionic ra . . . View Full Definition

Alkaline Earth Metal: The Group 2 elements, beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra) form alkaline oxides and hydroxides and are called 'alkaline earth metals'.

Aneroid Barometer: An instrument for measuring the atmospheric pressure. It registers the change in the shape of an evacuated metal cell to measure variations on the atmospheric pressure. The aneroid is a thin . . . View Full Definition