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प्रश्न
Which of the following elements involve gradual filling of 5f-level?
विकल्प
Lanthanoids
Actinoids
Transition metals
Coinage metals
MCQ
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उत्तर
Actinoids
Explanation:
Actinoids are the 14 elements from thorium (Th, Z = 90) to lawrencium (Lr, Z = 103). These elements involve the gradual filling of 5f orbitals in their electronic configurations. That is why they are also known as 5f-block elements. In contrast, lanthanoids involve filling of 4f orbitals. Actinoids are typically radioactive and show variable oxidation states.
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