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In the transition series starting from L...

In the transition series starting from Lanthanum (atom no =57), the next element hafmnium (atom no =72) why so observe this jump in atomic number ?

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Because after `""_57La` filling of 4f-orbital starts which is complete at atomic number =71. These 14 elements belonging to f-block and placed separately at the bottom of periodic table.
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OMEGA PUBLICATION-THE D- AND F-BLOCK ELEMENTS-MULTIPLE CHOICE QUESTIONS
  1. In the transition series starting from Lanthanum (atom no =57), the ne...

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  2. Which element belongs to d-block elements ?

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  3. The transition elements have a general electronic configuration of

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  4. The correct ground state electronic configuration of chromium atom (Z...

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  5. Which of the following electronic configuration is that of a transiti...

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  6. Which of the following elements is alloyed with copper to form brass?

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  7. Copper can be extracted from

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  8. Argentite is an ore of

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  9. The process used for the extraction of gold is

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  10. Important ore of zinc is

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  11. The inner transition elements are the elements in which the added elec...

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  12. Transition elements

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  13. The tendency of the transition elements to form coloured compounds is...

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  14. Which of the following is diamagnetic ?

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  15. The common oxidation state of the elements of lanthanide series is

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  16. Which of the following is a lanthanide ?

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  17. For the process Cu(g) to Cu^+ (g) + e^- , the electron is to be...

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  18. Paramagnetism is a property of

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  19. The first ionisation energy of silicon is lower than that of

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  20. Which of the following electronic configurations will have the lowest...

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  21. In general, the melting and boiling point of transition metals

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