(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) 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 same property like density, melting point etc as gallium element and it was proposed before the element was even discovered.

(b) (i) Eka boron.

(ii) Eka aluminium.

(iii) Eka-silicon.