Crystallography
This is the branch of science which covers the study of structure, geometry and the property of crystals is called crystallography.
(1) Symmetry in the Crystal : A crystal have following three types of symmetry,
(i) The plane of symmetry : It is an imaginary plane which passes through the centre of a crystal can divides it into two equal portions which are exactly the mirror images of each other.
(ii) Axis of symmetry : An axis of symmetry or axis of rotation is an imaginary line, which is passing through the crystal such that when the crystal is rotated with reference to this line, it presents the same appearance more than once in one complete revolution i.e., in a rotation through 360°. Suppose, the same appearance of crystal is repeated, on rotating it through an angle of 360°/n, around an imaginary axis, is called an n-fold axis here, n is the order of axis. By order is meant the value of n in 2∏/n so that rotation through 2∏/n gives an equivalent configuration.
Only simple the cubic system posses one centre of symmetry. Other system do not posses centre of symmetry.
The total number of the planes, axes and the centre of symmetries possessed by the crystal is known as elements of symmetry.
A cubic crystal possesses the total 23 elements of the symmetry.
The plane of symmetry ( 3 + 6) = 9
The axes of symmetry ( 3 + 4 + 6) = 13
Email based Chemistry assignment help - homework help at Expertsmind
Are you searching chemistry expert for help with Crystallography questions? Crystallography topic is not easier to learn without external help? We at www.expertsmind.com offer finest service of Chemistry assignment help and chemistry homework help. Live tutors are available for 24x7 hours helping students in their Crystallography related problems. We provide step by step Crystallography question's answers with 100% plagiarism free content. We prepare quality content and notes for Crystallography topic under chemistry theory and study material. These are avail for subscribed users and they can get advantages anytime.
Why Expertsmind for assignment help
- Higher degree holder and experienced experts network
- Punctuality and responsibility of work
- Quality solution with 100% plagiarism free answers
- Time on Delivery
- Privacy of information and details
- Excellence in solving chemistry queries in excels and word format.
- Best tutoring assistance 24x7 hours