alleryIn a coordinate (dative) bond, the shared pair of electrons:
AComes equally from both atoms
BComes from a metal cation only
CComes from a noble-gas core
DComes entirely from one atom
Answer & Solution
Correct answer: D. Comes entirely from one atom
1. In a coordinate (also called dative) covalent bond, ONE of the two atoms donates both electrons.
2. The other atom has an empty orbital to accept.
3. Example: NH₃ + H⁺ → NH₄⁺; the N lone pair becomes a shared pair with the proton.
4. Once formed, a coordinate bond is INDISTINGUISHABLE from an ordinary covalent bond.
_Source: syllabus Chem Ch 4 §4.2 Coordinate Bond_
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