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6 August, 15:34

In the 19th century, Dmitri Mendeleev predicted the existent of a then unknown element, X, with a mass of 68. He also predicted that an oxide of X would have the formula X2O3, on the modern period table. What is the group number and period of the element?

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  1. 6 August, 15:59
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    Base on your question that in 19th century when Dmitri Mendeleev predicted the existent of an unknown element X with a mass of 68 and he also predicted that an oxide would have a formula X203 on the modern table i think the element that Mendeleev predicted is (GA) Gallium
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