Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Soumadeep Nag posted an Question
November 08, 2022 • 17:43 pm
![]()
30 points
30 points
- IIT JAM
- Geology (GG)
Why there is not 5 fold symmetric in crystallography
why there is not 5 fold symmetric in crystallography
1 Answer(s)
Answer Now
- 0 Likes
- 1 Comments
- 0 Shares
Do You Want Better RANK in Your Exam?
Start Your Preparations with Eduncle’s FREE Study Material
- Updated Syllabus, Paper Pattern & Full Exam Details
- Sample Theory of Most Important Topic
- Model Test Paper with Detailed Solutions
- Last 5 Years Question Papers & Answers
Sign Up to Download FREE Study Material Worth Rs. 500/-
Banibrata majumder Best Answer
There is only available symmetry of 1,2,3,4 & 6- fold symmetry operations as any kind of 5 of more than 6 - fold symmetry is not able to completely cover a three dimensional space as a whole. 5-fold symmetry elements are not able to represent the whole space at all. Thus, there is no 5-fold symmetry element available for crystal analysis. The length, edges of principal axes, and angle between unit cells are all lattice constants. We can't pack objects like pentagons or octagons such that they fill up space entirely and that that's one reason there is no 5-fold or 8-fold rotational axis.