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Xenon: Element 54, a colorless, inert gas used to fill cathode ray tubes.

Xenon (Xe): Atomic number: 54, Atomic mass: 131.29 g.mol -1, Electronegativity: unknown, Density: 5.9*10-3g.cm-3 at 20°C, Melting point: - 112 °C, Boiling point: - 107 °C, Vanderwaals radius: 0.217 nm, . . . View Full Definition

Fluorine (F): Atomic number: 9, Atomic mass: 18.998403 g.mol -1, Electronegativity: 4, Density: 1.8*10-3 g.cm-3 at 20°C, Melting point: -219.6 °C, Boiling point: -188 °C, Vanderwaals radius: 0.135 nm, Ion . . . View Full Definition

Inert Gas: Any of the elements of Group 18, which includes helium, neon, argon, krypton, xenon, radon, and element 118. These elements are referred to as 'inert' or 'noble' because they do not easily f . . . View Full Definition