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Why are Zn, Cd and Hg not regarded as transition elements?
ABecause their d-orbitals are completely filled (d¹⁰) in both the ground state and in their common oxidation states
BBecause they have only one oxidation state
CBecause they are in the s-block
DBecause they are radioactive
Answer & Solution
Correct answer: A. Because their d-orbitals are completely filled (d¹⁰) in both the ground state and in their common oxidation states
**Transition element** = has incompletely filled d orbitals in its **ground state or any common oxidation state**. Zn, Cd, Hg have **d¹⁰** in both. So although in the d-block, they are not 'transition'. Scandium (3d¹) IS a transition element; zinc (3d¹⁰) is not.
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