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The order given in my book is NH3>SbH3>AsH3>PH3 Phosphorous is more electronegative than As and Sb then shouldn't the dipole moment be more in case of PH3 . And why does the anomaly of NH3 occur?

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  • $\begingroup$ Geometry/symmetry also has a role in determining the dipole, for example, if the molecules were planar as is $\ce{BF3}$ the dipole would be zero. $\endgroup$ – porphyrin Aug 16 at 16:56
  • $\begingroup$ @porphyrin could you convert this into a proper answer for this question $\endgroup$ – Stan Aug 16 at 17:59

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