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Which of the following statements is incorrect about the `f-` block elements ?A. `f-` block consists of two series, lanthanoids and actinoids.B. Lanthanoids shown in general stable common oxidation state, `+3`C. The actinoids are radioactive elements.D. Actinoids contractions is smaller from element to element then lanthanoid contraction.

Answer» Correct Answer - 4
In addition to 4f electrons, the 5f electrons themselves provide poor shielding from element to element in the series so, actionoid contraction is greater than lanthanoid contraction.


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