(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?

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Solution

(a) The properties of eka-aluminium, predicted by Mendeleev, which was undiscovered then, were almost similar to the actual properties of the element discovered later on. The comparison table below shows the similarities in the properties of the undiscovered element then and the actual element (Gallium).

Property Eka-Aluminium Gallium

Atomic Mass 68 69.7

Density $5.9 g / c m^{3}$ $5.94 g / c m^{3}$

Melting point low $30.2 o C$ (low)

Formula of oxide $E a_{2} O_{3}$ $G a_{2} O_{3}$

Formula of chloride $E a C l_{3}$ $G a C l_{3}$

(b) (i) Scandium (Sc) was known as eka-boron.
(ii) Gallium(Ga) as eka-aluminium.
(iii) Germanium (Ge) as eka-silicon.

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Similar questions

Q. Gallium and germanium (discovered later) were placed below aluminium and silicon in their respective groups. The names given by Mendeleev for Gallium and Germanium are Eka-aluminium and Eka-silicon. Similarly, the gap that he has left for the undiscovered element that comes after aluminium is given the name Eka-aluminium.

Mendeleev gave prefix ‘Eka’ (one) to the name of the preceding element for the undiscovered elements in the group. What do the names, Eka-aluminium and Eka-silicon represent according to Mendeleev?

Q. Mendeleev predicted the existence of some elements that had not been discovered at that time and left some gaps in his periodic table. What are the names that he had given to the two undiscovered elements, gallium and germanium, respectively?

Q. On what conditions or by comparing what conditions does Mendeleev was able to predict the properties for the undiscovered element and left the gap for them

Q. What were the names used to denote the existance of undiscovered elements such as gallium and germanium respectively?

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Property	Eka-Aluminium	Gallium
Atomic Mass	68	69.7
Density	$5.9 g / c m^{3}$	$5.94 g / c m^{3}$
Melting point	low	$30.2 o C$ (low)
Formula of oxide	$E a_{2} O_{3}$	$G a_{2} O_{3}$
Formula of chloride	$E a C l_{3}$	$G a C l_{3}$

(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?