What is so special about Pr, Nd, Tb and Dy lanthanoids? from Chem

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The d-And-f-Block Elements

Short Answer Type

91.

Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state.

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92. What is the general electronic configuration of inner transition elements?

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93. What is the common symbol used for lanthanoids.

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94.

Give the general electronic configurations of lanthanoids and actinoids.

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95. Why are the 4f and 5f inner transition metals called lanthanoids and actinoids, respectively?

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96. Which lanthanoid has maximum paramagnetism?

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97. Which is the most common oxidation state of lanthanoids?

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98. What is so special about Pr, Nd, Tb and Dy lanthanoids?

Pr, Nd, Tb and Dy lanthanoids along with usual +3 oxidation state also shows +4 oxidation state only in their oxide form as MO₂.

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99. Why does the hardness of lanthanoids increase along the series?

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100. Which is the hardest lanthanoid? Give reason.

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