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

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

A

neutron and magnesium

B

proton sulphur

C

iron and sulphur

D

gallium and germanium

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The correct Answer is:
D
`Eka`-aluminium implies after `A1` which is gallium `(Ga)` while `eka`-silicon implies after `Si` which is germanium `(Ge)`.
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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?

R SHARMA-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN ELEMENTS-Level
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  2. Which of the following element is most electropositive?

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

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  4. Which one of the following is the smallest in size?

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  5. Each group of the modern periodic table consists of a number of elemen...

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  6. An element X belongs to the fourth period and the fifteenth group of t...

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  7. Which of the following two elements in the periodic table are expected...

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  8. The correct order in which the first ionzation enthalpy increases is

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  9. The least stable in amongst the following is :

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  10. The lectronic configuration of the atom having maximum difference in f...

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  11. The electronic configurations of four elements are given below. Arrang...

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  12. The size of the following species increases in the order

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  13. The successive ionzation enegry values for an element X are given belo...

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  14. In which of the following arrangements, the order is according to the ...

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  15. In a given shell, the order of screeing effect is

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  16. Which one of the following sets of ions represents the collection of i...

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  17. Consider the following statements: (i) The radius of an atom is lar...

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  18. The first ionisation potential of Na is 5.1eV. The value of eectrons g...

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  19. Which of the following represents the correct order of increasing firs...

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