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31 maj 2016 · The \(x\)-axis stands perpendicular to the plane; For non-planar molecules, once the z-axis has been defined, the x-axis is the usually chosen so that the xz plane contains as many atoms as possible.
Symmetry axis: an axis around which a rotation by results in a molecule indistinguishable from the original. This is also called an n-fold rotational axis and abbreviated C n. Examples are the C 2 axis in water and the C 3 axis in ammonia.
A note on axis definitions: Conventionally, when imposing a set of Cartesian axes on a molecule, the z axis lies along the principal axis of the molecule, the x axis lies in the plane of the molecule (or in a plane containing the largest number of atoms if the molecule is non-planar), and the y axis makes up a right handed axis system. 3.
If an object has several axes with different order n, then the one with the highest order is called the principal axis. If there is more than one axis of the same order, then they get distinguished by primes if they are not conjugate.
Symbol for axes of symmetry C n where rotation about axis gives indistinguishable configuration every (360/n)o (i.e. an n-fold axis) Thus H2O has a C2 (two-fold) axis, BF3 a C3 (three-fold) axis. One axis can give rise to >1 rotation, e.g. for BF3, what if we rotate by 240o? B (1) FF(2) F (3) (3 )1 F 2) 240o Must differentiate between two ...
For planar molecules, if the z axis as defined above is perpendicular to the molecular plane, the x axis lies in the plane of the molecule and passes through the greatest number of atoms. If the z axis lies in the plane of the molecule, then the x axis stands perpendicular to the plane.
18 paź 2017 · A x vs y graph would ensure that the x axis is filled with fixed variables (quantities that do not change throughout the experiment, eg Time intervals) whereas in the y axis, you would intend to fill in the values that change during the experiment, eg number of observations.
