An entire group of elements was unknown when the periodic table was first developed because they were unreactive and no known compounds were composed of them. what most likely led to the inclusion of these elements in the periodic table? the formation of a compound in the laboratory new technology that showed how to identify one of the elements improvements in instruments to measure small masses more careful experiments to create synthetic elements
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An entire group of elements was unknown when the periodic table was first developed because they wer...
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