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What is actinoid contraction? Why actino...

What is actinoid contraction? Why actinoid contraction is greater than lanthanoid contraction?

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Steady decrease in the size of actinoids with increase in atomic number is known as actinoid contraction.
Actinoid contraction is greater from element in the series due to poor shielding by 5f electrons compared to 4f electrons.
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What is lanthanoid contraction ?

What are actinoids?

The lanthanoid contraction refers to :

The Lanthanides contraction is due to

Give reason: Actinoid contraction is greater from element to element than lanthanoid contraction.

Give reason : a) Cerium (Ce) exhibits +4 oxidation state. b) Actinoid contraction is greater from element to element than lanthanoid contraction.

SUBHASH PUBLICATION-THE 'd' - AND 'f' - BLOCK ELEMENTS -Question and Answer
  1. What happens when lanthanoids are heated in Carbon?

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  2. How lanthanoids reacts with water and dil. Acids?

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  3. What is mischmetall? Give its one use.

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  4. What is actinoid contraction? Why actinoid contraction is greater than...

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  5. Give reason: Actinoid contraction is greater from element to element t...

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  6. Give general oxidation state of actinoids. Why actinoids shows variabl...

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  7. Zr and Hf have almost identical atomic radii. Give reason.

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  8. Give reasons: Actinoids show variable oxidation states.

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  9. Give reasons: Zr and Hf have almost identical radii.

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  10. Give reason: Why Lanthanoids are less reactive than actinoids.

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  11. Out of the following elements identify the element which does not exhi...

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  12. Give Reason. Most of the transition metals have high melting point a...

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  13. Give Reason. Second ionisation enthalpy of copper is exceptionally h...

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  14. Give reason. Atomic size of 4d and 5d series elements are almost the...

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  15. Study of actinoid elements is difficult. Give two reasons.

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  16. Give reasons : Cerium (Ce) exhibits +4 oxidation state

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  17. Among Fe^(2+) and Fe^(3+) which is more stable? Give reason.

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  18. Give reason: Mn exhibits the higher oxidatoin state of +7 among 3d s...

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  19. Give reason: Cu^(2+) is paramagnetic and Cu^(+) is diamagnetic.

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  20. Give reason 'transition metals generally form coloured compound'.

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