Transition elements are the elements that are found in Groups 3-12 of the modern periodic table, that constitute the _____.

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Step-by-step explanation:

- Definition: Transition elements are defined as elements whose atoms or common ions have an incompletely filled $d$‑subshell.
- Position in periodic table: These elements are located in Groups 3–12, which correspond to the $d$‑block of the periodic table because their differentiating electron enters a $d$ orbital.
- Electron configuration: The general electronic configuration is $(n-1)d^{1-10}\;ns^{0-2}$, showing the filling of the $d$‑orbitals.

Therefore the correct completion is “d-block”, which is option (1). FINAL_ANSWER: a

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