NEET 2018 · ChemistryOxide naturePrevious Year Question
Which one of the following elements is unable to form ion?
Answer: (A) . \textbf{Answer:} (A) (boron).
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Correct Answer
(A)
Solution & Explanation
\textbf{Answer:} (A) (boron). \textbf{Solution:} Boron is a second-period element and has no vacant d-orbitals in its valence shell. Because of this it cannot extend its covalency beyond 4 and therefore cannot form . The heavier group-13 elements () have available d-orbitals and can form . This is an anomalous property of the second-period element.
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