Question

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How did Mendeleev predicted information about the elements which were not discovered at that time❓❓

Answer 1

Hey mate..!!
He was also able to work out the atomic mass of the missing elements, and so predict their properties. And when they were discovered, Mendeleev turned out to be right. For example, he predicted the properties of an undiscovered element that should fit below aluminium in his table.


Hope it helps.

Answer 2

Answer is in attachment