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Why are there fourteen elements in the l...

Why are there fourteen elements in the lanthanoid series?

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In the lanthanoid series the electrons are filled in 4f sub-shell. Since the 4f sub-shell can have a maximum of fourteen electrons, there are fourteen elements in the lanthanoid series
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Lanthanoids are-

Explain the following observations about the transition/ inner-transition elements : (i) There is in general an increase in density of elements from titanium (Z=22) to copper (Z=29). (ii) There occurs much more frequent metal-metal bonding in compounds of heavy transition elements (3rd series). (iii) The members in the actinoid series exhibit a large number of oxidation states than the corresponding members in the lanthanoid sereis

The size of the trivalent cations in the lanthanoid series decreases steadily as the atomic number increases. What is this known as ?

Explain the following observations : (i) Many of the transition elements are known to form interstitial compounds . (ii) There is a general increase in density from titanium (Z =22) to copper (Z = 29). (iii) The members of the actinoid series exhibit a larger number of oxidation states than the corresponding members of the lanthanoid series.

Assign reason for each of the following statement: (i) The largest number of oxidation states are exhibited by the elements in their row transition elements. (ii) The atomic radii decrease in Size with the increasing atomic number in the lanthanoid series

(a) What is meant by the term lanthanoid contraction ? What is it due to and what consequences does it have on the chemistry of elements following lanthanoids in the periodic table ? (b) Explain the following observations : (i) Cu^(+) ion is unstable in aqueous solutions . (ii) Although Co^(2+) ion appears to be stable , it is easily oxidised to Co^(3+) ion in the presence of a strong ligand. (iii) The E_(Mn^(2+)//Mn)^(@) value for manganese is much more than expected from the trend for other elements in the series.

Which of the following element belong to actinide series ?

Actinoid contraction is greater from element to element than lanthanoid contraction Why?

Why are transition elements so named ?

The first ionisation energies of the elements of the transition series.

VMC MODULES ENGLISH-PERIODIC PROPERTIES OF ELEMENTS -In Chapter Exercise-F
  1. Why are there fourteen elements in the lanthanoid series?

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  2. Predict the blocks and periods of the following elements. Br (35)

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  3. Which of these is the weakest base?

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  4. Which of the following sequence correctly represents the decreasing ac...

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  5. Period to which Aluminium belongs is

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  6. Period to which Calcium belongs is

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  7. Period to which chlorine belongs is

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  8. Which of the following alkaline earth metal suphate salt is the least ...

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  9. Which of these alkali metal ions undergo the maximum hydration when ad...

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  10. Period to which Neon belongs is

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  11. The easily decomposable carbonate among these is,

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  12. Atomic number of an element is 33. State the group to which it belongs...

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  13. Which of these is the weakest base?

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  14. Atomic number of an element is 32. State the group to which it belongs...

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  15. Atomic number of an element is 36. State the group to which it belong...

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  16. Atomic number of an element is 37. State the group to which it belongs...

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  17. A : Solubility of alkaline earth metal carbonates decreases down the g...

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  18. Which of the following alkaline earth metal suphate salt is the least ...

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  19. Which of these alkali metal ions undergo the maximum hydration when ad...

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  20. Atomic number of an element is 53. State the group to which it belongs...

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  21. The easily decomposable carbonate among these is,

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