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(a) How do the properties of eka-alumini...

(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?

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The correct Answer is:
(b)(i) Eka-boron (ii) Eka-aluminium (iii) Eka-silicon
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Explore conceptually related problems

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?

Did Mendeleev predict the properties of scandium and gallium even when these elements were not discovered ?

Mendeleev was a Russian chemist, who contributed the most for the development of periodic table of elements wherein the elements were arranged on the basis of their fundamental property, the atomic mass and also on the similarity of chemical properties. Only 63 elements were known at his time. He arranged the 63 elements in the increasing order of their atomic masses and found that there was a periodic recurrence of elements with similar physical and chemical properties, He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. How do we classify these newly discovered elements (eka-aluminium and eka-silicon)?

Assertion:According to mendeleev,the properties of elements are a periodic function of their atomic weights. Reason:Mendeleev left the gap under aluminium and a gap under silicon,and called these elements Eka-Aluminium and Eka-silicon.

Mendeleev's 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.

LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. NEWLAND'S LAW OF OCTAVES

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  2. (a) State the merits of Mendeleev's classification of elements. (b) ...

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  3. (a) How do the properties of eka-aluminium element predicted by Mendel...

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  4. (a) Why do we classify elements? (b) What were the two criteria used...

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  5. In Mendeleev's periodic table gap was not left for one of the followin...

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  6. The Newlands' law of octaves for the classification of elements was fo...

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  7. According to Mendeleev' periodic law, the elements were arranged in th...

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  8. Three elements B, Si and Ge are :

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  9. In Mendeleev's periodic table, gaps were left for the elements to be d...

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  10. The three imaginary elements X,Y and Z represent a Döbereiner's triads...

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  11. The atomic numbers of four elements P,Q,R and S are 6,8,14 and 16 resp...

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  12. Which of the following statement is correct in regard to the classific...

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  13. Which of the following statements about the modern periodic table is c...

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  14. An element X forms an oxide X(2)O(3). In which group of Mendeleev's pe...

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  15. The modern periodic table was prepared by

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  16. The atomic particle whose number in the atoms of an element always rem...

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  17. The atomic masses of three elements X,Y and Z having similar chemical ...

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  18. In the following set of elements one element does not belong to the se...

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  19. In the following set of elements, one element does not belong to the s...

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  20. Can the following groups of elements be classified as Dobereiner's tri...

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