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?

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Solution

The elements when they were discovered later on are:

Eka-boron : Scandium

Eka-aluminium : Gallium

Eka-silicon : Germanium.

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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?

Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.

(a) Name the element which has taken the place of (i) eka-aluminium and (ii) eka-silicon

(b) Mention the period/periods of these elements in the modern periodic table.

(d) Classify these elements as metals, non-metals or metalloids.

(e) How many valence electrons are present in the atoms of each of these elements?

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.

Q. The element "Eka-aluminium" predicted by Mendeleev was later discovered as

Give the atomic mass, formula of oxide and formula of hydride of the following elements as given by Mendeleev on the basis of his prediction.
(i) Eka-boron

(ii) Eka-aluminium

(iii) Eka-silicon

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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?

The elements when they were discovered later on are:Eka-boron : ScandiumEka-aluminium : GalliumEka-silicon : Germanium.

The elements when they were discovered later on are:

Eka-boron : Scandium

Eka-aluminium : Gallium

Eka-silicon : Germanium.