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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?

The lanthanum closely resembles the lanthanoids and is included in all its properties. Hence, the series is named after the nature of the metal as lanthanoids. Similarly, the nature has been given to 5f series metals as actinoids.

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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?

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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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