A) Practice: 1) Take one model from each crystal class (point group). Determine

Question

A) Practice: 1) Take one model from each crystal class (point group). Determine the symmetry elements indicated by the crystal class notation (use Table 2.2 on page 16 in the textbook), then find the symmetry elements on the model. (Use the figures in Chapter 2 of the book and your lab instructor for assistance). 4/m 3 2/m 4 3m 4/m 2/m 2/m 6/m 2/m 2/m 2/m 2/m 2/m 2/m 2) Make a table giving the name of each symmetry element and the number of each kind found, for example: Total symmetry content: 1 3-fold axis of rotoinversion (1A_3), 3 2-fold rotation axes (3A_2), 3 mirror planes (3m). Check the symmetry content versus that given in Table 2.2 (page 23). 3) For each of the crystal classes, look at the relationship between the crystallographic and rotational axes as described in Table 2.2. Use Table 2.2 to determine the crystal system. Crystal Class 4/m 3 2/m

Explanation / Answer

i am Answering this question by giving a complete table which will every informtion about all the given groups.

                                 Axes                                planes    centre            class name        system name

    class              2-fold    3-fold    4-fold   6-fold   

1) 4/m 3 2/m         6         4           3          -            9           yes              hexoctahedral     isomatric

2) 4 3m                 3        4            -           -           6           -                  hextetrahedral      isomatric

3)4/m 2/m 2/m      4       -            1          -            5           yes             di-tetragonal          tetragonal

                                                                                                           di-pyramidal

4)6/m 2/m 2/m      6           -           - 1    7    yes dihexagonal           hexagonal

dipyramidal     

5)2/m 2/m 2/m      3          -           -            -             3          yes             dipyramidal             orthorhombic

6)2/m                   1          -           -             -            1          yes             prismatic                monoclinic

so here above table mentions all of the question's ansers in one table regarding the symmetry elements and total symmetry contents with system name and class.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.