## What is the group order for C3v point group?

The number of elements h is called the order of the group. Thus C3v is a group of order 6.

**How many irreducible representations are present in C3v?**

The group C3v has: ➢ Three classes of symmetry elements ➢ Three classes of symmetry elements. ➢ Three irreducible representations.

**What is C3v group?**

the C3v point group. Its symmetry operations consist of two C3 rotations, C3, C32. (rotations by 120° and 240°, respectively about an axis passing through the nitrogen atom. and lying perpendicular to the plane formed by the three hydrogen atoms), three vertical. reflections, σv, σv’, σv”, and the identity operation.

### What are various types of representation of matrix?

C uses “Row Major”, which stores all the elements for a given row contiguously in memory. LAPACK defines various matrix representations in memory. There is also Sparse matrix representation and Morton-order matrix representation. Some languages such as Java store matrices using Iliffe vectors.

**What is reducible and irreducible representation in group theory?**

In a given representation (reducible or irreducible), the characters of all matrices belonging to symmetry operations in the same class are identical. The number of irreducible representations of a group is equal to the number of classes in the group.

**Is C3v a non Abelian group?**

With the help of Figure 4.6, one can derive the multiplication table of the C3v point group. One sees that the group is not Abelian because not all operations commute (e. g., C3 · σa = σc and σa · C3 = σb ).

## Which of the following molecules belongs to C3v point group?

CHCl_3 molecule

The CHCl_3 molecule belongs to the point group C3v.

**Is C3v Abelian group?**

**How many classes are present in C3v point group?**

Answer: In C3v there are three classes and hence three irreducible representations. 2) The characters of all operations in the same class are equal in each given irreducible (or reducible) representation.

### Which one is an example for C3v point group?

Molecules with C3v symmetry are common. Some examples include NH3, POCl3, XeF6 (very floppy), HCo(CO)4, trichloromethane, acetonitrile, 1,3,5-trichlorocyclohexane (all equatorial or all axial conformation), 1,3,5-trioxane, 1-azaadamantane, 1-azabicyclo[2.2.

**What is matrix and what are different types of matrix?**

Answer: Matrix refers to a rectangular array of numbers. A matrix consists of rows and columns. The various types of matrices are row matrix, column matrix, null matrix, square matrix, diagonal matrix, upper triangular matrix, lower triangular matrix, symmetric matrix, and antisymmetric matrix.

**How is the matrix representation of symmetry operations calculated?**

The matrices for Cnm as symmetry operation are calculated by an n-fold multiplication of matrix Cn. The symmetry operation C2 around axis x (x→x,y→-y, z→-z) and around axis y are (x→-x, y→y, z→-z):

## How is the matrix for a rotation derived?

The matrix for a rotation about axis z by an arbitrary angle Θ is derived easily if we imagine two two-dimensional coordinate planes with identical origin but an angular difference of Θ between the axes. In our context of symmetry, we just need to deal with the discrete values of Θ = 2π/n for the angle of rotation.

**How to obtain the matrix for rotatory reflection?**

For instance, to obtain the matrix for rotatory reflection S n (z) we multiply the matrices for the fundamental operations σ z and C n . Auf diesem Webangebot gilt die Datenschutzerklärung der TU Braunschweig mit Ausnahme der Abschnitte VI, VII und VIII.