Answer: Metal in a complex acquires electrons from ligands to achieve the electron count of the next noble gas.
- A Metal in a complex acquires electrons from ligands to achieve the electron count of the next noble gas
- B The metal instead loses electrons to its surrounding ligands in the complex during normal conditions
- C Ligands serve mainly to fix the oxidation state with little electron-count rule involved as generally observed
- D The coordination number is usually numerically equal to the oxidation state in typical laboratory settings
Correct answer: A. Metal in a complex acquires electrons from ligands to achieve the electron count of the next noble gas
Explanation: Sidgwick's EAN rule: the metal + ligand electron donation brings the metal to the same electron count as the nearest noble gas.
The three common coordination geometries: octahedral (6 ligands), tetrahedral (4 ligands), and square planar (4 ligands in one plane).
Concept context
Study of compounds where a central metal atom is bonded to surrounding ligands. Covers nomenclature, types of isomerism, bonding theories (VBT, CFT), and applications in medicine, photography, and industry.