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OpenStudy (anonymous):
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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OpenStudy (unklerhaukus):
eka-aluminum but it is now called germanium
OpenStudy (unklerhaukus):
my apologies it is (Ga) - Gallium not (Ge) -Germanium
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