Chemistry · d- and f-Block Elements
Which of the following statements regarding lanthanoids are true? i. The general electronic configuration of lanthanoids is [Xe] 4f1-14 5d0-1 6s2. ii. The 4f electrons in the penultimate shell are effectively shielded from the external chemical environment by the 5s and 5p electrons. iii. A characteristic feature of lanthanoids is the uniform (+3) oxidation state exhibited by all the metals. iv. Promethium (Pm) is the only artificial radioactive lanthanoid.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1i, ii and iv only
- 2i, ii, iii and iv✓
- 3i and ii only
- 4i, ii and iii only
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i, ii, iii and iv
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