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If the three elements X,Y and Z form a t...

If the three elements X,Y and Z form a triad and atomic weights of X and Z are 9 and 40 respectively then the atomic weight of an element y is _________

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PEARSON IIT JEE FOUNDATION-PERIODIC CLASSIFICATION OF ELEMENTS-Level 1
  1. Among all the groups the maximum number of elements is found in IIIB g...

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  2. In the modified mendelev 's periodic tables groups and periods are pre...

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  3. If the three elements X,Y and Z form a triad and atomic weights of X a...

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  4. Mendeleev named certain undiscovered elements as eka boron and eka alu...

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  5. According to Newland's classification the properties of the 3rd eleme...

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  6. Extremely electropositve metals are present in and groups

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  7. The atomic number of an element that belongs to the IVA group and 4th ...

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  8. Good reducing agents are found in and groups

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  9. Match the entries given in column A with appropriate ones in column B

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  10. Atomic weights of three elements in a doberenier traid are x , 81 and...

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  11. The porperties which increase on going down the group are

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  12. Which of the following belong to the same group? A^(3+) (number of ...

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  13. Which of the following is not true ?

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  14. The values of the second electron affinites of elelments are positive ...

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  15. Why is the ionisation energy of suphur less than that of phosphorous t...

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  16. The element which accepts electrons readily to form anion belongs to

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  17. Identify the oxide which forms the strongest base:

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  18. The formula of the oxide of an element M is M(2)O(3) The first four io...

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  19. The chemistry of alkali metals is essentially the chemitry of uniposit...

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  20. Na^(+),F^(-) and Mg^(+2) ions have the same

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