1. Krypton English chemist Sir William Ramsay discovered krypton in 1889 Krypton was named after the Greek word “krytos” which means hidden It was given this name because of its rarity along with its natural aspects Bronson Burdick 7-4 1

2. Krypton Krypton is a noble gas The atomic weight of krypton is ~39.948 The atomic number of krypton is 18 (Each neutral atom of krypton has 18 protons and 18 electrons) Bronson Burdick 7-4 2

3. Krypton Krypton’s standard gaseous state is 25˚ Celsius (77˚ Fahrenheit) Krypton has practically no color, nor smell Krypton is so uncommon it make up 1/1,000,000 of earths atmosphere Bronson Burdick 7-4 3

4. Krypton is so unreactive that no natural compound with krypton has ever been found One compound that Krypton could be in is a man-made compound known as KrF 4 (Krypton fluoride) Bronson Burdick 7-4 4 Krypton Another manmade compound is Krypton fluoride (KrF 2 )

5. Krypton In fluorescent light bulbs, a mixture of krypton and argon are put inside to keep the tungsten unreactive, which keeps the filament from over heating Krypton is used in some types of photographic flashes used in high speed photography Krypton gas is also combined with other gases to make luminous signs that glow with a greenish-yellow light Bronson Burdick 7-4 5

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7. Books: Dingle, Adrian. The Periodic Table. Boston: Kingfisher Publishers, 2007. Encyclopedias: Andrews, Frank C. “Krypton.” World Book 11 th volume. 2003 ed. Bronson Burdick 7-4 7

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