Variable valency is generally exhibited by:
Correct answer: B. Transition elements
- A. Normal elements
- B. Transition elements
- C. Metallic elements
- D. None of them
Explanation
Transition elements show variable oxidation states because: 1. The energy difference between 3d and 4s orbitals is very small. 2. Electrons of both 3d and 4s orbitals participate in bond formation (however, electrons are first lost from the 4s orbital).
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About Transition Elements
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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