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Radon: A naturally occurring gas that is suspected of causing lung cancer.

Radon (Rn): Atomic number: 86, Atomic mass: (222) g.mol -1, Electronegativity: unknown, Density: 9.96*10-3g.cm3 at 20°C, Melting point: - 71 °C, Boiling point: - 62 °C, Vanderwaals radius: unknown, Ioni . . . View Full Definition

Radon System: A ventilation system beneath the floor of a basement and/or structural wood floor and designed to fan exhaust radon gas to the outside of the home

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

Ununoctium (Uuo): Atomic number: 118, Atomic mass: unknown, Electronegativity: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: unknown, Is . . . 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

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

Working Level (WL): A unit of measurement for documenting exposure to radon decay products. One working level is equal to approximately 200 picoCuries per liter.