how Mendeleev predicted the elements???
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Answer:When Mendeleev proposed his periodic table, he noted gaps in the table and predicted that as-then-unknown elements existed with properties appropriate to fill those gaps. He named them eka-boron, eka-aluminium and eka-silicon, with respective atomic masses of 44, 68, and 72.
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He predicted them by atomic masses. It worked well for elements with lower masses and those matched well. Later the prediction become harder because elements show irregular increasing masses.
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