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?

Eka-aluminium and Eka-silicon

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Eka-boron and Eka-aluminium

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Eka-silicon and Eka-aluminium

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Eka-aluminium and Eka-boron

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Solution

The correct option is A Eka-aluminium and Eka-silicon
Mendeleev predicted the existence of some elements that had not been discovered at that time and left some gaps in his periodic table. He named them by prefixing a Sanskrit numeral, Eka (one) to the name of preceding element in the same group.

The gap that he has left for the undiscovered element that comes after aluminium is given the name Eka-aluminium. Gallium which was discovered later exhibits similar properties as that of Eka-aluminium and placed in the same groups as that of aluminium. Similarly, the gap that he has left for the undiscovered element that comes next to silicon is given the name Eka-silicon. Germanium which was discovered later matches with Eka-aluminium in properties.

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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.

The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminium and eka-silicon. What names were given to these elements when they were discovered later on?

Q. State true or false.
Gallium and germanium (discovered later) are placed below aluminium and silicon in their respective groups. The names of Gallium and Germanium as given by Mendeleev are Eka-aluminium and Eka-silicon.

Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-Silicon and Eka-Aluminium.
Name the elements which have taken the place of these elements

Q. Mendeleev ′ predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
Classify these elements as metals, non-metals or metalloids

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