Q26 of 181 Page 282

What names were given by Mendeleev to the then undiscovered elements(i) scandium (ii) gallium, and (iii) germanium ?

(i) Scandium was named as Eka- Boron.

(ii) Gallium was named as eka- alluminium


(iii) Germanium was named as eka- silicon.


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Describe two anomalies of Mendeleev’s periodic classification of element.

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How do the properties of eka- aluminium element predicted by Mendeleev compare with the actual properties of gallium element ? Explain your answer.

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Why do we classify elements ?

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What were the two criteria used by Mendeleev to classify the elements in his periodic table ?