Am entire group of elements was unkiown when the periodic table was first developed because they were unreactive and no knoun compounds were composed of them What most lkely led to the incusion of these

Am entire group of elements was unkiown when the periodic table was first developed because they were unreactive and no knoun compounds were composed of them What most lkely led to the incusion of these elements in the periodic table?

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Am entire group of elements was unkiown when the periodic table was first developed because they were unreactive and no knoun compounds were composed of them What most lkely led…

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