CaI2 Molecular Geometry

Drawing and predicting the CaI2 molecular geometry is very easy. Here in this post, we described step by step method to construct CaI2 molecular geometry.

Key Points To Consider When drawing The CaI2 Molecular Geometry

A three-step approach for drawing the CaI2 molecular can be used. The first step is to sketch the molecular geometry of the CaI2 molecule, to calculate the lone pairs of the electron in the central calcium atom; the second step is to calculate the CaI2 hybridization, and the third step is to give perfect notation for the CaI2 molecular geometry.

The CaI2 molecular geometry is a diagram that illustrates the number of valence electrons and bond electron pairs in the CaI2 molecule in a specific geometric manner. The geometry of the CaI2 molecule can then be predicted using the Valence Shell Electron Pair Repulsion Theory (VSEPR Theory) and molecular hybridization theory, which states that molecules will choose a CaI2 geometrical shape in which the electrons have from one another in the specific molecular structure.

Finally, you must add their bond polarities characteristics to compute the strength of the Ca-I bond (dipole moment properties of the CaI2 molecular geometry). The calcium-iodine bonds in the calcium iodide molecule(CaI2), for example, are polarised toward the more electronegative value iodine atom, and because both bonds have the same size and polarity, their sum is zero due to the CaI2 molecule’s bond dipole moment, and the CaI2 molecule is classified as a nonpolar molecule.

The molecule of calcium iodide (with linear CaI2 molecular geometry) is tilted at 180 degrees and has a difference in electronegativity values between iodine and calcium atoms, with iodine’s pull being greater than calcium’s. As a result, it has no dipole moment in its molecular structure. The CaI2 molecule has no dipole moment due to an equal charge distribution of negative and positive charges.

CaI2 Molecular Geometry

CaI2 electron and molecular geometry

According to the VSEPR theory, CaI2 possesses a linear molecular geometry and a CaI2-like electron geometry. Because the center atom, calcium, has two Ca-I bonds with the two iodine atoms surrounding it. The I-Ca-I bond generates a 180-degree angle in the linear geometry. The CaI2 molecule has a linear shape because it contains two iodine atoms.

There are two Ca-I bonds at the linear CaI2 molecular geometry. After linking the two iodines in the linear form, it maintains the linear-like structure. In the CaI2 linear molecular geometry, the Ca-I bonds have stayed in the two terminals of the molecule.

The center calcium atom of CaI2 has no lone pairs of electrons, resulting in linear electron geometry. However, the molecular geometry of CaI2 is linear in nature. It’s the CaI2 molecule’s symmetrical geometry. As a result, the CaI2 molecule is nonpolar.

How to find CaI2 molecular geometry

Calculating lone pairs of electron in CaI2 molecular geometry:

  1. Determine the number of lone pairs on the core be an atom of the CaI2 Lewis structure.
    Because the lone pairs on calcium are mostly responsible for the CaI2 molecule geometry distortion, we need to calculate out how many there are on the central calcium atom of the Lewis structure.

Use the formula below to find the lone pair on the CaI2 molecule’s central calcium atom.

L.P(Ca) = V.E(Ca) – N.A(Ca-I)/2

Lone pair on the central calcium atom = L.P(Ca)

The core central calcium atom’s valence electron = V.E(Ca)

Number of Ca-I bonds = N.A (Ca-I)

calculation for calcium atom lone pair in CaI2 molecule

In the instance of CaI2, the central atom, calcium, has two electrons in its outermost valence shell and two Ca-I bond connections.

As a result of this, L.P(Ca) = (2 –2)/2=0

In the CaI2 electron geometry structure, the lone pair on the central calcium atom is zero. It means there are no lone pairs in the core calcium atom.

Calculate the number of molecular hybridizations of CaI2 Molecular Geometry

How do you find the CaI2 molecule’s hybridization? We must now determine the molecular hybridization number of CaI2.

The formula of CaI2 molecular hybridization is as follows:

No. Hyb of CaI2 = N.A(Ca-I bonds) + L.P(Ca)

No. Hy of CaI2= the number of hybridizations of CaI2

Number of Ca-I bonds = N.A (Ca-I bonds)

Lone pair on the central calcium atom = L.P(Ca)

Calculation for hybridization number for CaI2 molecule

In the CaI2 molecule, calcium is a core atom with two iodine atoms connected to it and no lone pairs. The number of CaI2 hybridizations (No. Hyb of CaI2) can then be estimated using the formula below.

No. Hyb of CaI2= 2+0 =2

The CaI2 molecule hybridization is two. The sp hybridization is formed when one S orbital and one p orbital join together to form a molecular orbital.

Notation of CaI2 Molecular Geometry:

Determine the form of CaI2 molecular geometry using VSEPR theory. The AXN technique is commonly used when the VSEPR theory is used to calculate the shape of the CaI2 molecule.

The AXN notation of CaI2 is as follows:

The center carbon atom in the CaI2 molecule is denoted by the letter A.

The bound pairs (Ca-I) of electrons to the core atom are represented by X.

The lone pairs of electrons on the center calcium atom are denoted by the letter N.

Notation for CaI2 molecular geometry

We know that calcium is the core atom, with two electron pairs bound (two Ca-I) and zero lone pairs. The general molecular geometry formula for CaI2 is AX2.

According to the VSEPR theory, if the CaI2 molecule has an AX2 generic formula, the molecular geometry and electron geometry will both be linear geometrical forms.

Name of MoleculeCalcium iodide
Chemical molecular formulaCaI2
Molecular geometry of CaI2Linear form
Electron geometry of CaI2Linear form
Hybridization of CaI2SP
Bond angle (I-Ca-I)180º degree
Total Valence electron for CaI216
The formal charge of CaI2 on calcium0


In this post, we discussed the method to construct CaI2 molecular geometry, the method to find the lone pairs of electrons in the central calcium atom, CaI2 hybridization, and CaI2 molecular notation. Need to remember that, if you follow the above-said method, you can construct a CaI2 molecular structure very easily.

What is CaI2 Molecular geometry?

CaI2 Molecular geometry is an electronic structural representation of molecules.

What is the molecular notation for CaI2 molecule?

CaI2 molecular notation is AX2

The polarity of the molecules

Polarity of the molecules are listed as follows

Lewis Structure and Molecular Geometry

Lewis structure and molecular geometry of molecules are listed below

External Reference:

Information on CaI2 molecule

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