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NOBLE GASES, , POSITION OF NOBLE GASES IN THE PERIODIC TABLE, , 1. What are noble gases?, , 2. Why is it more appropriate to call the zero group elements as noble gases instead of, inert gases?, , 3. Comment on the statement “Periodic table was incomplete before the discovery of, noble gases”., , 4. Who discovered the first noble gas, Argon?, , 5. Which noble was discovered in sun’s atmosphere?, , GENERAL CHARACTERISTICS OF NOBLE GASES, , 1. Explain the following:, a. lonization energies of noble gases are very high., b. Electron affinities of noble gases are almost zero., c. The melting and boiling points of noble gases are extremely low., , d. Solubility of noble gases in water increases as their atomic number increases, in the group., , HISTORY OF DISCOVERY OF NOBLE GASES, , 1. Discuss the factors which led to the late discovery of compounds of noble gases., 2. Who discovered the reactivity of noble gases for the first time?, , 3. Write the reaction which lead to the first noble gas compound., , 4. Noble gas compounds usually involve xenon, fluorine and oxygen. Explain., , 5. He, Ne and Ar do not form compounds with O2 and F2 where Xe does form. Explain., , ISOLATION OF NOBLE GASES FROM AIR, , 1. Explain the method of fractional distillation for the separation of noble gases., 2. Explain Rayleigh method for the separation of noble gases., 3. Explain Ramsay method for the separation of noble gases., , 4. Explain Dewar's Charcoal method for the separation of noble gases.