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Which of the following element was discovered after the discovery of Mendeleev’s periodic table?

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Solution

The element Gallium was discovered after the discovery of Mendeleev’s periodic table. Here are the steps:

  1. Dmitri Mendeleev published his periodic table in 1869.

  2. He left gaps in his table for elements that were not known at that time but he predicted their existence and properties.

  3. Gallium was one of these elements. It was discovered in 1875 by French chemist Paul-Émile Lecoq de Boisbaudran.

  4. The properties of Gallium matched closely with the predictions made by Mendeleev, which further validated his periodic table.

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