The decrease in atomic radii is small in transition elements due to:
Correct answer: D. Shielding effect
- A. Intervening electrons
- B. d-shell
- C. Screening effect
- D. Shielding effect
Explanation
Due to the poor shielding effect of d-electrons, the outer electrons experience a more effective nuclear charge. Due to a greater effective nuclear charge, their size contracts slightly and thus, there is less variation among the size of transition elements.
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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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