why mendeleeff leave certain blank spaces in his periodic table?
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Because he predicted the presence of some elements yet to be discovered at his time. so he left blank spaces for those predicted elements
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Mendeleev left gaps in his table to place elements not known at the time. By looking at the chemical properties and physical properties of the elements next to a gap, he could also predict the properties of these undiscovered elements. ... The element germanium was discovered later.
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