1.
Scientists before Mendeleev had observed that certain elements reacted similarly with other chemicals. Which further observation led Mendeleev to create the periodic table?
A The elements within these groups often differed
physical properties, such as color and texture
B. The atomic weights of the elements within these groups were spaced at nearly regular increments
C The reactivity of the elements within these groups varied at nearty regular increments
D. Elements that did not fit in these groups belonged in the lanthanide and actinide series
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