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In the transition series, starting from ...

In the transition series, starting from lanthanum `La(Z=57)`, the next element hafnium `Hf(Z=72)` has an atomic number of 72. Why do we observe this jump in atomic number?

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This is because after `._(57) La`, filling of 4 f-orbital starts which is complete at atomic number 71.These 14 elements , therefore, belong to f-block and placed separately at the bottom of the periodic table.
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PRADEEP-D- AND F-BLOCK ELEMENTS-ADDITIONAL QUESTIONS (VERY SHORT ANSWER QUESTIONS)
  1. Each transition series contains only 10 elements because

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  2. Zinc, cadmium and mercury are generally not considered as transition ...

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  3. In the transition series, starting from lanthanum La(Z=57), the next e...

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  4. Which out of the following is//are transition elements //s and why ? ...

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  5. Both Cu and Zn have completely filled 3d atomic orbitals. Cu is cons...

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  6. The atomic sizesof Fe,Co and Ni are nearly same, Explain with reason....

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  7. How does the ionic/covalent character of the compounds of a transition...

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  8. Name the element in the 3d series that (i) shows maximum oxidation s...

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  9. What is the common oxidation state of Cu, Ag and Au ?

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  10. which metal in the first series of transition metals exhibits +1 oxid...

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  11. Which of the following is an example of disproportionation reaction?

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  12. Write all posible oxidation state of an element having atomic number 2...

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  13. Why does vanadium pentoxide act as a catalyst?

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  14. Why Zn^(2+) salts are white while Ni^(2+) salts are blue

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  15. Out of [Sc(H(2)O)(6)]^(3+) and [Ti(H(2)O)(6)]^(3+)ions which is colo...

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  16. (a) Which metal in the first transition series (3d series) exhibits+ 1...

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  17. Copper (I) compounds are white and diamagnetic while copper(II) compou...

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  18. Which divalent metal ion has maximum paramagnetic character among the ...

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  19. Which of the two is paramagnetic : V (IV) or V (V) and why ?

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  20. Which reagent can be used to identify Ni^(2+) ion ?

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