KCET · Chemistry · Classification of Elements and Periodicity in Properties
The correct order of first ionisation enthalpy of given elements is
- A \(\mathrm{Li}<\mathrm{B}<\mathrm{Be}<\mathrm{C}\)
- B \(\mathrm{Be}<\mathrm{Li}<\mathrm{B}<\mathrm{C}\)
- C \(\mathrm{C}<\mathrm{B}<\mathrm{Be}<\mathrm{Li}\)
- D \(\mathrm{Li}<\mathrm{Be}<\mathrm{B}<\mathrm{C}\)
Answer & Solution
Correct Answer
(A) \(\mathrm{Li}<\mathrm{B}<\mathrm{Be}<\mathrm{C}\)
Step-by-step Solution
Detailed explanation
Ionisation enthalpy of elements generally
increases on going from left to right along a period.
But Be nane half-filled electronic configuration which requires more energy to ionise as compare to \(B\). Thus, the correct order will be \(\mathrm{Li}<\mathrm{B}<\mathrm{Be}<\mathrm{C}\).
increases on going from left to right along a period.
But Be nane half-filled electronic configuration which requires more energy to ionise as compare to \(B\). Thus, the correct order will be \(\mathrm{Li}<\mathrm{B}<\mathrm{Be}<\mathrm{C}\).
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