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Which defect of Mandeleeff's periodic ta...

Which defect of Mandeleeff's periodic table is automatically overcome by shifting the basis from atomic number ?

A

Position of isotopes

B

Placing coinage metals along with alkali metals

C

Position of hydrogen

D

All the above

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BEYOND PUBLICATION-CLASSIFICATION OF ELEMENTS THE PERIODIC TABLE-EXERCISE
  1. Point out the correct statement

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  2. Which is not the characteristic of a period ?

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  3. Which defect of Mandeleeff's periodic table is automatically overcome ...

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  4. Which of the following indicates the correct order of variation in ato...

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  5. Choose the correct answer for the following matching :

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  6. Elements belonging to the same period have

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  7. The scientist who made maximum contribution towards periodic table was

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  8. Which of the following sets of atomic numbers corresponds to the atomi...

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  9. Atomic numbers of last elements of 'd' block and p block of incomplete...

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  10. The outermost shell of a representative element contains x electrons a...

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  11. Which of the following statements about the modern periodic table are ...

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  12. Choose the right properties of periodic table. (a) Atomic radius incr...

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  13. Which of the following species does have electrons equal to 18 ? (a) K...

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  14. Pick out the correct statements about chlorine atom. (a) Chlroine is ...

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  15. What are the elements that belonged to 18th (or) '0' group ? (a) Heliu...

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  16. Electronic configuration from ns^2 np^1 to np^2 np^6 are called

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  17. 1 pm = …………..

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  18. block elements are called as lanthanides and actinides in modern perio...

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  19. "The law states hat the physical and chemical properties of the ...

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  20. VI A group elements are called chalcogens. This is because

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