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Which one of the following belongs to th...

Which one of the following belongs to the group of atomic weights of Dobereiner triads ?

A

`1`. 40, 87.5, 120

B

`2`. 40, 87.5, 127

C

`3`. 40, 77.5, 137

D

`4`. 40, 88.5, 137

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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS-THE PERIODIC TABLES-EXERCISE
  1. Number of vertical columns in the modern periodic table are (As per IU...

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  2. A Dobereiners Triad in the following, is ........................

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  3. Which one of the following belongs to the group of atomic weights of D...

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  4. 11, 12, 13 and 14 are the atomic numbers of the elements Na, Mg, Al an...

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  5. The most electronegative element is

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  6. Raju : All the known elements at the time of Dobereiner. could not be ...

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  7. (i) Newlands proposed the law of octaves. ii) The law of octaves was ...

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  8. State and give one example for Dobereiner's law of triads and Newland'...

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  9. "Select the common point/s' in Dobereiner and Newlands Laws. i) Atomic...

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  10. Assertion (A) : Mendeleeff placed "Be, Mg and Ca" in one group. Reaso...

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  11. Which one is not a salient features of the Mendeleeff's periodic table...

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  12. A: The properties of elements are the periodic functions of their atom...

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  13. Assertion (A) : It is a better way of arranging the elements in the pe...

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  14. Z indicates in the notation ^A.Xz. i) Number of protons in the atom ii...

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  15. Assertion (A): Na' is a s-block element Reason (R) : 'Na' gets its las...

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  16. Assertion (A) : 'Cl' is a non-metal. Reason (R): Non-metal has five or...

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  17. (a) Lanthanoids and actinoids are belongs to 3rd group. b) Lanthanoids...

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  18. Assertion (A) : Lanthanides and Actinides are called as Inner  Transit...

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  19. Why do elements in the same group have similar physical and chemical p...

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  20. The pair of elements that have similar chemical properties are

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