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Dauphas N, Marty B. Radon reacts readily with fluorine to form a solid compound, but this decomposes on attempted vaporization and its exact composition is uncertain. The usefulness of radon compounds is limited because of the noble gas's radioactivity. Oxygen in the small amount of air remaining inside the light bulb reacted with the metal filament. This corroded the filament and caused dark deposits on the glass. Filling a light bulb with argon gas prevents these problems. That's why modern light bulbs are filled with argon.
Noble gases are also used to fill the glass tubes of lighted signs like the one in the figure below. Although noble gases are chemically nonreactive, their electrons can be energized by sending an electric current through them. When this happens, the electrons jump to a higher energy level. When the electrons return to their original energy level, they give off energy as light. Different noble gases give off light of different colors.
Neon gives off a reddish-orange light, like the word "Open" in the sign below. Krypton gives off violet light and xenon gives off blue light. Watch the video about noble gases at the following URL, and then answer the questions below. How can elements have different isotopes? How can elements be broken down? How can elements properties be predicted? What is a chemical element?
What element in the fourth period of the periodic table has 5 valence electrons?
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