Dear student, BiH3 < AsH3 < PH3 < NH3 N is a smaller central atom, and additionally, it is more electronegative It attracts all the electrons closer to itself At smaller distances, the repulsion between bond pair electrons increases There will be repulsion between H-H atoms When the central atom gets smaller and smaller, steric (repulsive) effects between the outer atoms prevent them from "touching" each other So, smaller central atoms (N in NH3) give rise to larger bond angles So, the H-N-H bond angle should be significantly larger than the H-P-H angle When the central atom is big enough that the H-H distance is large compared to the size of the H atom, the steric effects grow vanishingly small Hence, the decrease in bond angle will be present Hope this information will clear your doubts about topic If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible Regards

Answer to this ?

Dear student,

BiH₃ < AsH₃ < PH₃ < NH₃

N is a smaller central atom, and additionally, it is more electronegative. It attracts all the electrons closer to itself.

At smaller distances, the repulsion between bond pair electrons increases. There will be repulsion between H-H atoms.

When the central atom gets smaller and smaller, steric (repulsive) effects between the outer atoms prevent them from "touching" each other.
So, smaller central atoms (N in NH₃) give rise to larger bond angles. So, the H-N-H bond angle should be significantly larger than the H-P-H angle.

When the central atom is big enough that the H-H distance is large compared to the size of the H atom, the steric effects grow vanishingly small. Hence, the decrease in bond angle will be present.

Hope this information will clear your doubts about topic.

If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.

Regards

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