The name given to the geometric arrangement of the reacting species at the time of reactions is called --------------------?

The name given to the geometric arrangement of the reacting species at the time of reactions is called the "molecular geometry" or "molecular shape." To determine the molecular geometry of a compound, you need to consider the number of electron pairs around the central atom and the type of electron pairs (bonding or non-bonding).

Here's how you can determine the molecular geometry:

1. Draw the Lewis structure of the molecule, indicating all the bonds and lone pairs of electrons.
2. Determine the steric number of the central atom by counting the number of atoms bonded to the central atom and the number of lone pairs present.
3. Use the steric number to determine the electron pair geometry based on the following:
- Steric Number 2: linear electron pair geometry
- Steric Number 3: trigonal planar electron pair geometry
- Steric Number 4: tetrahedral electron pair geometry
- Steric Number 5: trigonal bipyramidal electron pair geometry
- Steric Number 6: octahedral electron pair geometry

4. Once you have determined the electron pair geometry, consider the bonding and lone pairs of electrons to determine the molecular geometry:
- If all regions of electron density are bonding pairs, the molecular geometry will be the same as the electron pair geometry.
- If there are one or more lone pairs of electrons, the molecular geometry may be different and can be determined based on the repulsion between lone pairs and bonded pairs.

Remember, lone pairs of electrons exert a stronger repulsion than bonded pairs, so they can affect the molecular shape. Examples of common molecular geometries include linear, bent, trigonal planar, tetrahedral, trigonal pyramidal, and more.

By following these steps, you can determine the molecular geometry of a compound.

The name given to the geometric arrangement of the reacting species at the time of reactions is called the "molecular geometry" or "molecular structure."