Besides gallium, which other elements have since been discovered that were left by Mendeleev in his Periodic Table? (Any two)

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Solution

The relationship between an element's atomic mass and its characteristics is periodic.
Mendeleev's periodic law, which was based on atomic mass, was altered as a result of the discovery of atomic numbers.
Oxides and hydrides with similar formulas are created by elements with similar chemical characteristics.
These characteristics were utilized by Mendeleev to develop his periodic table.
Mendeleev's categorization of elements has certain limitations:
Failed to explain where isotopes are located.
It was impossible to explain why some elements' atomic masses were in the wrong sequence.
The periodic table was unable to assign hydrogen a place.
Other than gallium, Mendeleev only included Germanium and Scandium in his Periodic Table after they were discovered.

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