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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties3 Marks
Question
  1. Out of N and O which have high first ionisation enthalpy?
  2. Write general electronic configuration off-block elements.
  3. Define hydrogen bonds.
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Answer

i. ' $N$ ' has higher ionisation enthalpy because it has half filled p-orbitals $\left(2 p^3\right)$ which is more stable.
ii. $(n-2) f^{1 to 14} (n-1) d^{0-1} n s^2$
iii. Hydrogen bond is the force of attraction between hydrogen and most electronegative atom like F, N, O.

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