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Which of the following statements is incorrect

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Atomic radius of Zr and Hf are same due to Lanthanide contraction

Np shows +3,+4,+5,+6 and +7 oxidation states

Electronic configuration of Thorium is [Rn] 5f¹6d¹7S²

Lanthanides liberate Hydrogen gas from dilute acids

answer is C.

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Detailed Solution

Electronic configuration to Thorium (Z = 90) is [Rn] 6d² 7S²
Among Actinoids both Actinium and Thorium have no electron in 5f sublevel.

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