In this tutorial, us will comment on ICl2- lewis structure, molecular geometry, polar or nonpolar, hybridization, etc.

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Name of MoleculeIodine dichloride
Chemical formulaICl2-
Molecular geometry of ICl2-Linear
Electron geometry that ICl2-Trigonal bipyramidal
NatureNonpolar molecule
Bond angle180°
Total Valence electron in ICl2- lewis structure22

ICl2- lewis structure includes one iodine atom in ~ the middle position whereas two chlorine atom at the neighboring position. There space three lone pairs present on the main atom the ICl2- lewis structure.

Also, the iodine main atom in ICl2- lewis framework violates the octet together it is holding an ext than 8 electrons in that is octet shell.

Follow some procedures for drawing the lewis structure of ICl2-

1. Count full valence electron in ICl2-

As the lewis chart is all around filling the valence electron roughly the atom within a molecule, hence, discover the total valence electron in ICl2- molecule.

To counting the valence electron in ICl2- molecule, look in ~ the periodic team of iodine and also chlorine atom in the periodic table. Due to the fact that both iodine and chlorine atom belongs to the same periodic group(Group 17), they have same valence electrons.

⇒ Total number of the valence electron in chlorine atom = 7

⇒ Total variety of the valence electrons in iodine atom = 7

∴ Total variety of valence electron obtainable for ICl2- lewis framework = 7 + 7(2) + 1 = 22 valence electrons  <∴ICl2- molecule has one iodine and also two chlorine atom v one negative charge ion>


2. Uncover the least electronegative atom and placed it in ~ center

A much less electronegative atom is capable to share much more electrons, hence, the the very least electronegative atom bring away the center position in the lewis diagram.

In the case of the ICl2- molecule, both iodine and also chlorine atoms belong come the same routine group but “the electronegativity of an facet decrease as we down the group”.

Hence, the iodine atom(2.66) is much less electronegative than the chlorine atom(3.16), so, place iodine in ~ the central position and chlorine spaced evenly around it.


3. Attach outer atoms to central atom with a single bond

In this step, connect both chlorine atom to the iodine main atom v the assist of a solitary bond.


Now counting the valence electrons we offered in the over structure. One single bond method two bonded bag of electrons. In the above structure, we use two solitary bonds because that connecting both next chlorine atoms to the iodine central atom.

Therefore, (2 solitary bond × 2) = 4 valence electrons we offered in the above structure from a total of 22 valence electrons that is easily accessible for ICl2-.

∴ (22 – 4) = 18 valence electrons

So, we room left through 18 valence electrons more.

4. Place remaining valence electrons beginning from outer atom first

Now start placing the continuing to be valence electron on the external atom(chlorine) to complete their octet i.e. Offering 8 valence electron in the external shell of each chlorine atom.


As you check out in the over figure, we have actually place 6 valence electrons represented as dots approximately both political parties chlorine atoms. This is due to the fact that each chlorine atom currently sharing 2 valence electrons with the help of a solitary bond.

Hence, (one solitary bond + 6 valence electron together dots) method a full of 8 valence electrons room present roughly each chlorine atom, hence, both of lock completed your octet comfortably.

Now count the continuing to be valence electrons. In the over structure, (12 valence electrons stood for as dots + 2 single bond that consists of 4 electrons) room uses, hence, (12 + 4) = 16 valence electron are offered from total of 22 valence electron accessible for ICl2-.

∴ (22 – 16) = 6 valence electrons

So, we are left with only 6 valence electrons.

5. Complete main atom octet and make covalent link if necessary

We have 6 continuing to be valence electrons and also iodine is the main atom that demands 8 electrons in the octet come attains stability. However the iodine atom already has 4 electrons in that octet because of two solitary bonds associated to it.

But iodine atom can broaden the octet i.e. Having an ext than 8 valence electrons in the external shell, this is since iodine is below duration two top top the regular table and have an extra d-orbital easily accessible hence, it has actually the capacity to increase the octet.

So, placed these 6 remaining valence electrons approximately the iodine central atom. 


As we see in the above figure, the iodine main atom it s okay 10 electrons(6 represented as dot + 2 single bonds) in its external shell and violates the octet rule. But this is no the issue, some elements can hurt the octet to gains stability.

So, both atoms (iodine and also chlorine) completed your octet and we use all the full valence electrons the are easily accessible for drawing the ICl2- lewis structure.

Now we will check the stability of the over structure with the assist of a formal charge concept.

6. Examine the security with the assist of a formal fee concept

To calculate the formal fee on one atom. Usage the formula offered below-

⇒ official charge = (valence electrons – lone pair electrons – 1/2 bonded pair electrons)

First, count the formal fee on the chlorine atom.

For chlorine atom:

⇒ Valence electrons of chlorine = 7

⇒ Lone pair electrons on chlorine = 6

⇒ shared pair electrons around chlorine(1 solitary bond) = 2

∴ (7 – 6 – 2/2) = 0 formal fee on both political parties chlorine atom.

 For iodine atom

⇒ Valence electrons of iodine = 7

⇒ Lone pair electron on iodine = 6

⇒ shared pair electrons approximately iodine (2 single bonds) = 4

∴ (7 – 6 – 4/2) = -1 formal charge on the iodine main atom.


The all at once formal charge in ICl2- lewis framework is -1 i beg your pardon is equal to the charge on the ion(ICl2- molecule has actually one an adverse charged ion).

So, the above structure is the many stable, and also lastly, placed the bracket approximately both sides of the Iodine dichloride lewis structure and also show its an adverse charged ion.


ICl2- lewis structure

The lewis structure for ICl2+


For ICl2+, we have actually 20 valence electrons and the central atom iodine has 2 lone pairs and 2 mutual pairs.

The molecular geometry of ICl2- is linear and also the electron geometry is trigonal bipyramidal, this is because the iodine central atom has three lone pairs on an equatorial position and also 2 bonded pairs are attached come it.

As every VSEPR theory, the three lone bag on iodine main atom repel every other also as adjacent bonded pairs, together a result, the shortcut pair and also lone pair moved apart from each other and also distorted the shape.

∴ The result molecular shape of ICl2- shows up linear.


We can additionally find the molecular and also electron geometry of ICl2- v the AXE method.

AXE is the straightforward generic formula that is based on bonded atom and also lone pair on central atom that a molecule.

AXE notation for ICl2- molecule:

A denotes the main atom, so, iodine is the main atom, A = IodineX represent the bonded atom to the central atom, as we know, iodine is bonded through two chlorine atoms. Therefore, X = 2E stand for the lone pair on the central atom, together per ICl2- lewis structure, iodine has actually three lone pairs. Hence, E = 3

So, the AXE share formula because that the ICl2- molecule becomes AX2E3.


Image source

VSEPR theory or chart says, if the central atom of any molecule is attached through two external inspection atoms and contains a full of three lone pairs then the molecular shape of the molecule is linear, and electron geometry is trigonal bipyramidal in nature.


Hybridization the ICl2-

To discover the hybridization of ICl2-, just recognize the steric number of the main atom.

The steric number can be found by the addition of lone pair and also bonded atom to a central atom.

∴ Steric number of ICl2- = (Number that bonded atom to iodine + Lone pair ~ above iodine main atom)

The iodine central atom is bonded through two chlorine atoms and contains a total of 3 lone pairs according come the ICl2- lewis structure.

∴ Steric variety of ICl2- = (2 + 3) = 5

Steric numberHybridization

So, we get the Sp3d hybridization because that ICl2- molecule because that a steric variety of five.

A polar molecule has non zero dipole moment and charges are dispersed asymmetrical anywhere the atoms. In nonpolar molecules, charges are the same, hence, every dipole is canceled out.

So, Is ICl2- polar or nonpolar? ICl2- the molecule is nonpolar in nature due to the fact that its molecular shape is linear that method dipole the is induced because of the difference in electronegativity value of iodine and also chlorine atoms are strictly opposite in direction to every other. 

“Also, the 3 lone bag of electrons on iodine central atom space 120∘ away indigenous each adjacent one, a rotationally-symmetric configuration; so, the lone-pair-bonding-pair repulsions amount to publication out as well.”

The dipoles that space generated together with the bonds(I-Cl) will certainly cancel the end to provide a net dipole moment of zero in every directions regardless of whether of the difference in electronegativity value in between iodine and also chlorine.

Hence, the cancellation of dipole and also symmetric geometry renders the ICl2- nonpolar in nature.


What makes the molecular geometry that ICl2- linear?

As every the ICl2- lewis structure, iodine is the central atom that has 3 lone pairs and 2 bonded pairs attached to it. These electron pairs (lone pair + bond pair) will certainly repel every other and tried to go much away to minimization the repulsion.

Hence, in every this process, this electron pairs about iodine atom take the position where repulsion in between them stays minimum and also the final molecular form of ICl2- shows up as direct geometry with bond edge 180°.

Also, the share formula because that ICl2- is AX2E3 which indicates the linear molecular shape and also trigonal bipyramidal electron geometry.

Why go the iodine central atom in ICl2- lewis framework violate the octet and attains more than 8 electrons?

This is since the iodine atom is below period two ~ above the periodic table and also has an access to the d-orbital, for this reason when it i do not care necessary, the iodine atom have the right to open that is extra d-orbital and also attains much more than 8 electron to finish the octet.

Examples the some aspects that can broaden their octet whenever it’s required – Sulfur, phosphorus, silicon, and also chlorine, etc.

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“Elements in the first 2 periods of the routine Table perform not have accessibility to the d sublevel and also must adhere come the octet rule.”


The full valence electron is obtainable iodine dichloride lewis framework is 22.The steric number of iodine main atom in the ICl2- the molecule is 5, thus, it develops Sp3d hybridization.The nature of ICl2- is nonpolar since all dipole that created along the bond will cancel out because of symmetry geometry that it.A full of 9 lone pairs(3 lone bag on main atom whereas 6 lone pairs on outer atoms) and also 2 bonded bag are present in ICl2- lewis structure.The molecule geometry that ICl2- is linear whereas electron geometry is trigonal bipyramidal.The bond angle in ICl2- molecule is 180º.