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Which group of elements could be placed ...

Which group of elements could be placed in mendeleev's periodic table without disturbing the original order ? Give reason.

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The correct Answer is:
Nobals gas; They are chemiclly unreactive
NA
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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. Name two elements whose properties were predicted on the basis of thei...

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  2. A,B and C are the elements of a Deobereiner's triad. If th atomic mass...

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  3. Which group of elements could be placed in mendeleev's periodic table ...

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  4. Fill in the following blanks with suitable words: (a) The basis for...

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  5. (a) What is meant by (i) a group and (ii) a period in a periodic table...

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  6. NEWLAND'S LAW OF OCTAVES

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

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

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

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

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

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

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  13. Three elements B, Si and Ge are :

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

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

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

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

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

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

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  20. The modern periodic table was prepared by

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