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Sizes of the seond and third row transit...

Sizes of the seond and third row transition elements are almost the same because of

A

`d`-orbital contraction

B

lanthanide contraction

C

actinide contraction

D

both `(2)`and `(3)`

Text Solution

Verified by Experts

The correct Answer is:
B
`4f` electrons of lanthanides have good cumulative shielding effect.
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R SHARMA-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN ELEMENTS-Follow-up Test
  1. Which of the following statements is not correct?

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  2. Which of the following has the smallest ionic radius?

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  3. Sizes of the seond and third row transition elements are almost the sa...

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  4. which of the following has largest radius ?

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  5. Which of the following species will have the largest size?

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  6. Which of the following is not correct?

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  7. Which of the following has the largest atomic radius?

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  8. For the transition elements, the variations in atomic radii are not so...

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  9. While dealing with multielectron atoms or ions, we must use the concep...

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  10. In SI system, the ionizarion enthalpy is measured in

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  11. Ionization enthalpies are

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  12. The first ionzation enthalpies generally increase form to right across...

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  13. The largest ionization enthalpies in any period occur for the

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  14. The values of ionzation enthalpies tend to increase within each period...

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  15. Ionization enthalpies tend to decrease going down any column of main g...

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  16. Ionizarion is not limited to the removal of a single electron from an ...

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  17. Which of the following elements has a large jump between its fourth an...

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  18. Arrange the following elements in the order of incresing first ionizar...

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  19. The first four ionization enthalpies of an element are 578 kJ mol^(-1)...

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  20. Electron gain enthalpy of an element is a measure of its atom's abilit...

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