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The d-block is marked by the filling of:
AOuter s orbitals
BInner d orbitals
COuter p orbitals
DInner f orbitals
Answer & Solution
Correct answer: B. Inner d orbitals
1. Each block is named for the orbital being filled.
2. In these elements the inner d orbitals take the electrons.
3. That is why they are called the d-block elements.
_Source: NCERT Class 11 Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._
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