(a) How do the properties of eka-aluminium element predicted by Mendeleev compare with the actual properties of gallium element? Expalin 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-alumiunium, 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 5.9g/cm³ 5.94g/cm³

Melting point low 30.2^oC (low)

Formula of oxide Ea₂O₃ Ga₂O₃

Formula of chloride EaCl₃ GaCl₃

(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

(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?

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

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Property	Eka-Aluminium	Gallium
Atomic Mass	68	69.7
Density	5.9g/cm³	5.94g/cm³
Melting point	low	30.2^oC (low)
Formula of oxide	Ea₂O₃	Ga₂O₃
Formula of chloride	EaCl₃	GaCl₃

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