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Did Mendeleev predict the properties of ...

Did Mendeleev predict the properties of scandium and gallium even when these elements were not discovered ?

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yes
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(a) How do the properties of eka-aluminium element predicted by Mendeleev compare with the actual properties of gallium element? Explain your answer. (b) What names were given by Mendeleev to the then undiscovered elements (i) Scandium (ii) gallium, and (iii) germanium?

Mebdeleev's classification was a great improvement over contemporary tabulation of the elements by Newlands and Lothar Meyer because (i) it grouped the elements together more accurately in vertical columns. (ii) it left gaps for elements which were yet to be discovered in nature. (iii) it made possible the predication of the properties of elements that had not yet been discovered. (iv) it predicted that atomic masses of certain elements were incorrectely determined.