Question:
Which one of the following is correct for all elements from Sc to Cu ?
Which one of the following is correct for all elements from Sc to Cu ?
Updated On: Apr 1, 2025
- The lowest oxidation state shown by them is +2
- 4S orbital is completely filled in the ground state
- 3d orbital is not completely filled in the ground state
- The ions in +2 oxidation states are paramagnetic
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The Correct Option is D
Solution and Explanation
Let's evaluate each option:
- (A) The lowest oxidation state shown by them is +2: This is incorrect. The lowest oxidation state of elements like Scandium (Sc) is +3, not +2.
- (B) 4s orbital is completely filled in the ground state: This is incorrect. The 4s orbital is not completely filled in all elements from Sc to Cu. For example, Ti has only one electron in the 4s orbital in the ground state.
- (C) 3d orbital is not completely filled in the ground state: This is incorrect. The 3d orbital is not completely filled in many elements from Sc to Cu in their ground state.
- (D) The ions in +2 oxidation states are paramagnetic: This is correct. Most of the transition metals from Sc to Cu, when in the +2 oxidation state, have unpaired electrons in their d orbitals, making them paramagnetic.
Therefore, the correct answer is (D) : The ions in +2 oxidation states are paramagnetic.
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