Question

Name six elements which was not known at the time of Mendeleev , but when

discovered later found to have the same properties as predicted by Mendeleev.​

Answer 1

Answer:

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Explanation:

Gallium, germanium, and scandium were all unknown in 1871, but Mendeleev left spaces for each and predicted their atomic masses and other chemical properties. Within 15 years, the “missing” elements were discovered, conforming to the basic characteristics Mendeleev had recorded.

Answer 2

Answer:

Gallium, germanium, and scandium were all unknown in 1871, but Mendeleev left spaces for each and predicted their atomic massesand other chemical properties. Within 15 years, the “missing” elements werediscovered, conforming to the basic characteristics Mendeleev had recorded.