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Noble gases were not discovered when Mendeleev formulated his periodic table in 1869. Hence noble gases were not shown in the periodic table of 1869.

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No, noble gases were not shown in the Periodic Table of 1869 because they were not discovered until late 19th and early 20th centuries. Helium was the first noble gas to be discovered in 1895, followed by other noble gases such as neon, argon, krypton, and xenon.

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Q: Were noble gases shown in the periodic table of 1869?
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