Why group 15elemnts excpet nitrogen have 90 bond angle?
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This shape is found when there are four bonds all on one central atom, with no extra unshared electron pairs. In accordance with the VSEPR (valence-shell electron pair repulsion theory), the bond angles between the electron bonds are arccos(−1/3) = 109.47°. ... The bond angle is 90 degrees.
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The bond angel between the electron bonds are across (-1/3)=109.47° so... the bond angel is 90°✌
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