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2. Explain the significance of the discovery of gallium (mass number 68) to Mendeleev periodic table

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Please see below for an explanation of the significance of gallium: Gallium is a chemical element with an atomic number of 31 and symbol Ga. It was first discovered by French chemist Paul-Émile Lecoq de Boisbaudran in 1875. Gallium is classified as a metal and belongs to Group 13 of the Periodic Table, alongside other elements such as aluminium, indium, and thallium. Under normal temperature and pressure, gallium is a soft, silvery metal. However, it takes on an icy white hue when it's in a liquid state. It's important to use caution when handling gallium, as too much force could cause it to shatter conchoidally. Since its discovery, gallium has been used to produce alloys with low melting points and is commonly used in semiconductors. It serves as a dopant on semiconductor substrates. In 1875, Lecoq discovered gallium while studying zinc blende. He found that the properties of the newly discovered element matched those of eka-aluminum, which was predicted by Mendeleev to have an atomic weight of 69. The specific gravity of gallium was also found to be 5.9, as predicted by Mendeleev. Lecoq named the element gallium in honor of Mendeleev, acknowledging and supporting his theories. For more information about gallium, please visit brainly.com/question/13398355.