Which element of 5th group doesn't have unpaired valence electrons in d-sub shell?
Correct answer: D. La
- A. V
- B. Nb
- C. Ta
- D. La
Explanation
Lanthanum (La) is a lanthanide element, not a transition metal. It belongs to the 3rd transition series and has its d-orbitals completely filled.
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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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