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What are the definite gaps of atomic num...

What are the definite gaps of atomic numbers in a group?

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2,8,8,18,18 and 32
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PATHFINDER-PERIODIC CLASSIFICATION OF ELEMENTS AND PERIODIC PROPERTIES-QUESTION BANK
  1. Name the element whose positon in the periodic table is still controve...

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  2. What are the definite gaps of atomic numbers in a group?

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  3. An element is present in the third period of p-block. It has 5 electro...

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  4. What is the modern name of the element 'ekaboron' as predicted by Mend...

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  5. Write down the electronic configuration of the outermost electronic or...

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  6. The electronic configuration of an elements is[Ar]3d^8 4S^2 . Name the...

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  7. Namea transition metal which is used as catalyst.

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  8. Arrange mg, A1, Si and Na in the increasing order of their lonisation...

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  9. Mention one similarity in property of Li and Mg which are diagonally r...

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  10. Why are the most of the atoms or ions of transition elements paramagne...

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  11. With what types of elements a period of the periodic table starts and ...

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  12. Mention one similarity in atoms of the elements belonging to the same ...

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  13. Arrange the different sub-energy levels in the decreasing order of scr...

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  14. Mention a property whhich is not periodic property of elements.

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  15. Arrange Mg^2+ , O^2- , Na^+ and F^- in the descending order of their i...

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  16. Which one of the iso-electronic ions K^+ , Cl^- , S^(2-) and Ca^(2++) ...

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  17. Which important property did Mendeleev use to classify the elements in...

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  18. Fourth period has 18 elements and not 52. Explain.

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  19. Give the general electronic configuration of 's' and 'p'-block element...

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  20. What are 'transition' elements?

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