Iridium: First LEO-based global communications system backed by Motorola. Built primarily for voice transmissions, it was launched in 1998 and went into Chapter 11 in 1999.

 

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Iridium: First LEO-based global communications system backed by Motorola. Built primarily for voice transmissions, it was launched in 1998 and went into Chapter 11 in 1999.

Iridium (Ir): Atomic number: 77, Atomic mass: 192.2 g.mol -1, Electronegativity: 2.2, Density: 22.4 g.cm-3 at 20°C, Melting point: 2450 °C, Boiling point: 4527 °C, Vanderwaals radius: 0.126 nm, Ionic radi . . . View Full Definition

Ruthenium (Ru): Atomic number: 44, Atomic mass: 101.1 g.mol -1, Electronegativity: 2.2, Density: 12.2 g.cm-3 at 20°C, Melting point: 2250 °C, Boiling point: 4150 °C, Vanderwaals radius: 0.135 nm, Isotopes: . . . View Full Definition

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 ] 4 . . . View Full Definition

Kilogram: The kilogram (kg) is the base unit of mass in the SI system of units. The standard kilogram is a 1 kg corrosion resistant platinum/iridium cylinder, carefully preserved in the suburbs of Par . . . View Full Definition

Palladium (Pd): Atomic number: 46, Atomic mass: 106.42 g.mol -1, Electronegativity: 2.2, Density: 11.9 g.cm-3 at 20°C, Melting point: 1560 °C, Boiling point: 2927 °C, Isotopes: 9, Vanderwaals radius: 0.065 . . . View Full Definition

Meitnerium (Mt): Atomic number: 109, Atomic mass: 265.9 g.mol -1, Electronegativity: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: unkn . . . View Full Definition

Osmium (Os): Atomic number: 76, Atomic mass: 190.2 g.mol -1, Electronegativity: 2.2, Density: 22.5 g.cm-3 at 20°C, Melting point: 3045 °C, Boiling point: 5027 °C, Vanderwaals radius: 0.136 nm, Ionic radi . . . View Full Definition

Big LEO: Low-earth orbit satellite systems that will offer voice and data services, including Iridium and Globalstar.

Platinum (Pt): Atomic number: 78, Atomic mass: 195.09 g.mol -1, Electronegativity: 2.2, Density: 21.4 g.cm-3 at 20°C, Melting point: 1772 °C, Boiling point: 3800 °C, Vanderwaals radius: 0.138 nm, Ionic rad . . . View Full Definition