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Atoms and Molecules

Class 9 Atoms & Molecules - Fact

Learn more about Atoms and Molecules of Class 9.


Russian chemist Dmitri Mendeleev predicted technetium's existence when he published the first periodic table of the then 63 known elements in 1869, but it was nearly another 70 years before it was discovered The first new atom made by man was?technetium,


 

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