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Eka-aluminium and eka-silicon are known ...

`Eka`-aluminium and `eka`-silicon are known as

A

Gallium and Germanium

B

Aluminium and Sillicon

C

Iron and Sulphur

D

Boron and Technitium

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The correct Answer is:
D
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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?

Mendeleve predicted the exitence of certain elements not known at that time and named to 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. (c) Write the group/groups 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 these elements?