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  2. Tetrahedral molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Tetrahedral_molecular_geometry

    This angle may be calculated from the dot product of the two vectors, defined as a ⋅ b = ‖ a ‖ ‖ b ‖ cos θ where ‖ a ‖ denotes the length of vector a. As shown in the diagram, the dot product here is –1 and the length of each vector is √ 3, so that cos θ = – ⁠ 1 / 3 ⁠ and the tetrahedral bond angle θ = arccos ...

  3. Bent's rule - Wikipedia

    en.wikipedia.org/wiki/Bent's_rule

    Yet, clearly the bond angles between all these molecules deviate from their ideal geometries in different ways. Bent's rule can help elucidate these apparent discrepancies. [5] [20] [21] Electronegative substituents will have more p character. [5] [20] Bond angle has a proportional relationship with s character and an inverse relationship with ...

  4. Molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Molecular_geometry

    Molecular geometries can be specified in terms of 'bond lengths', 'bond angles' and 'torsional angles'. The bond length is defined to be the average distance between the nuclei of two atoms bonded together in any given molecule. A bond angle is the angle formed between three atoms across at least two bonds.

  5. VSEPR theory - Wikipedia

    en.wikipedia.org/wiki/VSEPR_theory

    For example, the double-bond carbons in alkenes like C 2 H 4 are AX 3 E 0, but the bond angles are not all exactly 120°. Likewise, SOCl 2 is AX 3 E 1, but because the X substituents are not identical, the X–A–X angles are not all equal. Based on the steric number and distribution of Xs and Es, VSEPR theory makes the predictions in the ...

  6. Constraint (computational chemistry) - Wikipedia

    en.wikipedia.org/wiki/Constraint_(computational...

    The method was then generalised to handle any holonomic constraint, such as those required to maintain constant bond angles, or molecular rigidity. [ 11 ] In SHAKE algorithm, the system of non-linear constraint equations is solved using the Gauss–Seidel method which approximates the solution of the linear system of equations using the Newton ...

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  8. VALBOND - Wikipedia

    en.wikipedia.org/wiki/VALBOND

    The hybridization of the bonding orbitals are obtained from empirical formulas based on Bent's rule, which relates the preference towards p character with electronegativity. The VALBOND functions are suitable for describing the energy of bond angle distortion not only around the equilibrium angles, but also at very large distortions.

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