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The 5f series of inner transition metals is called the:
AChalcogens
BActinoids
CLanthanoids
DHalogenoids
Answer & Solution
Correct answer: B. Actinoids
1. The other inner transition series fills the 5f orbitals.
2. It runs from thorium to lawrencium.
3. These are the actinoids.
_Source: NCERT Class 12 Chemistry Part I, Chapter 8, The d- and f-Block Elements._
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