Lakhmir Singh Solutions Class 10 Chemistry Solutions for Exercise in Chapter 5 - Chapter 5 Periodic Classification of Elements

Question 51 Exercise

(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?


(a) Eka-aluminium and gallium are the two different names for a single element. Eka-aluminium has the same property like density, melting point, etc as gallium element.

(b) (i) Eka boron.

(ii) Eka aluminium.

(iii) Eka-silicon.

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