Symmetry Axis

ElementSubstance composed of atoms, each of which has the same atomic number (Z) and chemical properties. The chemical properties of an element are determined by the arrangement of the electrons in the various shells (specified by their quantum number) that surround the nucleus. In a neutral atom, the number of of rotational symmetryProperty of an object if some spatial manipulation of it results in an indistinguishable object. A symmetric object can be superimposed on itself by some operation.. Imaginary axis is placed through a perfect crystal so that during a single rotation about this axis the outline of the crystal form appears identically more than once; 2, 3, 4 or 6 times.