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Lanthanides and actinides resemble in...

Lanthanides and actinides resemble in

A

electronic configuration

B

oxidation state

C

ionization energy

D

fromation of complexes

Text Solution

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The correct Answer is:
A
Electric configuration lanthanide `4f^(1-14) 5d^(1) 6 s^(2)` and electronic configuration of actionid `5f^(1-14) 6d^(1), 7s^(2)`.
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The f-block elements are those in which the differentiating electron enters the (n-2)f orbital. There are two series of f-block elements corresponding to filling of 4f and 5f-orbitals called lanthanides and actinides respectively. They show different oxidation states depending upon the stability of f^0, f^7 and f^14 configurations, though the principal oxidation state is +3. There is a regular decrease in size of lanthanide ions with increase in atomic number and it is known as lanthanide contraction. As a result of this, the basic character of oxides and hydroxides decreases from first element (La) to last element (Lu). All the actinides are radioactive and therefore, it is difficult to study their chemical nature. Which of the following statements is not true ?

The f-block elements are those in which the differentiating electron enters the (n-2)f orbital. There are two series of f-block elements corresponding to filling of 4f and 5f-orbitals called lanthanides and actinides respectively. They show different oxidation states depending upon the stability of f^0, f^7 and f^14 configurations, though the principal oxidation state is +3. There is a regular decrease in size of lanthanide ions with increase in atomic number and it is known as lanthanide contraction. As a result of this, the basic character of oxides and hydroxides decreases from first element (La) to last element (Lu). All the actinides are radioactive and therefore, it is difficult to study their chemical nature. The atomic numbers of three lanthanide elements X,Y and Z are 65,68 and 70 respectively. The basic character of their hydroxides will decrease as

A2Z-THE D AND F BLOCK ELEMENTS-Lanthanides And Actinides
  1. The lanthanide contraction is responsible for the fact that

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  2. Across the lanthanide series, the basicity of the lanthanoid hydroxide...

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  3. Lanthanides and actinides resemble in

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  4. Lanthanides contraction cause.

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  5. The speration of lanthanides by ion exchanges method is based on

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  6. The radiocative lanthanide is

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  7. Complete the following reaction

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  8. The pair of lanthanides with the highest third ionization energy is

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  9. All actinods have high desities except

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  10. Which one of the following is an electronic configuration of thorium?

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  11. Consider the following statement, (I) The size of the lanthanide M^(...

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  12. The actinoids exhibit, more member of oxidation states in general than...

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  13. Which of the following factor may be regarded as the main cause of lan...

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  14. In which 5f subshell is half-filled?

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  15. The actinides showing +7 oxidation state are:

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  16. Which of the following is not an actinide?

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  17. Which of the following statements is not correct?

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  18. Which of the following elements shows maximum number of different oxid...

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  19. Gadolinium (Gd) has 4f^(7) 5 d^(1) 6s^(2) electronic configuration out...

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  20. Which of the following elements is not an actinide?

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