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Question
There are 14 elements in actinoid series. Which of the following elements does not belong to this series?
Options
U
Np
Tm
Fm
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Solution
Tm
Explanation:
In the periodic table, actinides lie from atomic number 90 to 103.
Thulium is not an actinide; it is a lanthanide.
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RELATED QUESTIONS
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Actinoids show irregularities in their electronic configurations.
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Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements.
How would you account the following :
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Identify the CORRECT statement.
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(i) Am
(ii) Pu
(iii) U
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Reason: Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding.
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What causes actinoid contraction?
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