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In Mendeleev's periodic table, gaps were...

In Mendeleev's periodic table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later ?

A

`Be`

B

`Si`

C

`Ge`

D

`Se`

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The correct Answer is:
C
NA
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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. According to Mendeleev' periodic law, the elements were arranged in th...

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  2. Three elements B, Si and Ge are :

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

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

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

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

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

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

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  9. The modern periodic table was prepared by

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

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

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

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

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

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  15. Consider the following elements: Na, Ca, Al, K,Mg, Li (a) Which of...

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  16. Which element has (a) two shells, both of which are completely filled...

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  17. Consider the followng elements: Ca, Cl, Na, I, Li, Ba Sr, K, Br Se...

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  18. Mendeleve predicted the exitence of certain elements not known at that...

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  19. A part of the early classification of elements has been given below: ...

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  20. (a) Explain why: (i) All the elements of a group have similar chemic...

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