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(A) Transition elements are capable of forming complex compounds primarily due to the following reasons: $1$. Small size and high nuclear charge. $2$.

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Presence of empty $d$-orbitals

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(A) Transition elements are capable of forming complex compounds primarily due to the following reasons: $1$. Small size and high nuclear charge. $2$. Availability of vacant $d$-orbitals of suitable energy to accept lone pairs of electrons from ligands. $3$. Variable oxidation states. Among the given options,the presence of empty $d$-orbitals is the most significant factor that allows them to accept electron pairs from ligands to form coordinate bonds.

Transition elements form complex compounds due to:

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