Is Br2 a polar or nonpolar substance?

Bromine is a bromine-based chemical compound having the formula Br2. At room temperature, it is a fuming red-brown tinted liquid. It quickly evaporates to generate a gas of the same hue. It is positioned at the third lightest halogen position in the periodic table. Many individuals are unsure whether or not Br2 is polar. I’ll address this question and discuss its qualities and applications in this essay.

Is Br2 polar or nonpolar, then? Br2 (Bromine) is nonpolar because both bromine atoms in this molecule have the same electronegativity, resulting in an equal charge distribution and a net-zero dipole moment. The structure is linear.

Bromine is a liquid having a reddish-brown texture at ambient temperature. It is very flammable and easily evaporates into a gas.

It’s a halogen compound, hence it’s categorised as such. Chlorine and fluorine are two examples of such chemicals.

Bromine has an atomic number of 35. In its outermost electrical form, it has one valence electron.

The bromine molecule has two bromine atoms in its chemical makeup and has a molecular weight of 79.904 g/mol.

Bromine is a highly reactive element that is not found in nature in large quantities. Bromine gas fumes are extremely poisonous when inhaled. It can irritate the mouth, throat, and eyes.

When it comes to the chemical structure of the Bromine molecule, it is a linear molecule with two covalently connected bromine atoms at each ends.

To complete their octet, both atoms share one electron with each other.

Bromine has an electronegativity of 2.96. Because both atoms have the same electronegativity, their influence on the bonded pair of electrons is the same.

The strength with which an atom can attract the bound pair of electrons is known as electronegativity.

The bromine molecule is nonpolar in nature due to the reasons stated above.

What Is the Difference Between Polar and Nonpolar Molecules?

Bond forces hold the atoms in the molecules together. Ionic, covalent, metallic, and hydrogen bonds are examples of bond types.

When compared to other forms of bonding, covalent and ionic bonds are more stronger.

The polarity of covalent bonds can vary based on a variety of conditions.

Polar Molecules: These are molecules with covalently bound atoms that have an uneven charge distribution.

If both atoms have different electronegativity and share an unequal quantity of charge, the covalent bond between them is said to be polar.

The dipole moment of these molecules is not zero. IF5, HO2, and other molecules are examples of such molecules. You can look into the explanation for IF5’s polarity.

Non-Polar Molecules: These are molecules with covalently bound atoms that have an equal charge distribution.

When two atoms form a bond, they are said to be nonpolar if their electronegativity is equal and they share an equal fraction of charge.

Hexane, CO2, and other similar compounds are examples. You can look into the reason for Hexane’s non-polarity.

It’s worth noting that a non-polar molecule with a geometrically symmetric form can have a polar bond within it. However, because of its symmetric form, the polarity cancels out, resulting in a nonpolar molecule.

Br2 is a nonpolar molecule for a reason.

The bromine molecule has a geometrical structure that is linear. In addition, there are two bromine atoms in it.

When the atoms in a molecule have the same electronegativity value, they have the same influence on bound electrons.

As a result, the charge distribution of both atoms is equal.

More electronegative atoms obtain partial negative charge in polar molecules because they share a bigger fraction of bonded electron pair.

In polar molecules, each molecule has two poles (negative and positive).

However, the charges on both atoms of the Br2 molecule are the same, making it a nonpolar molecule.

Br2’s Lewis and Molecular Structure

The Lewis structure of Br2 is comparable to that of F2, Cl2, and other molecules.

The halogen elements, which include atoms like Br, Cl, and F, are found in the 7th group of the periodic table.

The br2 molecule is a diatomic molecule with 14 valence electrons.

To complete their octet, both atoms share one electron with each other.

The diatomic molecule has a geometrical structure that is linear.

The molecular structure of the bromine diatomic molecule is depicted in the diagram below.

You should read the article on Lewis structure and geometry of Br2 to learn more about the molecule’s lewis structure, hybridization, and geometry.

Factors that influence a molecule’s polarity

Electronegativity: An atom’s electronegativity is its ability to attract the bound electron pair. The bound electrons are drawn somewhat more towards an element with higher electronegativity.

When the electronegativity of the atoms in a molecule differs, the molecule is said to be polar.

A molecule’s polarity is proportional to the difference in electronegativity between its atoms.

The word “dipole moment” is used to describe how a molecule’s polarity is measured. D is the abbreviation for it (SI unit Debye). It is the product of the charge on atoms and the distance between them in mathematics.

The dipole moment of a molecule is also related to its polarity.

Q * R = D

Geometrical Structure: Symmetrically shaped molecules have a dipole moment of zero (nonpolar). Asymmetric molecules have a nonzero dipole moment, whereas symmetric molecules have a zero dipole moment (polar).

Nonpolar molecules are linear-shaped molecules that have the same electronegativity of both atoms.

Br2’s Characteristics

Bromine is a reddish-brown liquid that evaporates quickly into gaseous vapours.

Bromine has a density of roughly 3.1028 g/cm3 in liquid form.

This compound has a melting point of 265.8 K (7.2 °C) and a boiling point of 332.0 K (58.8 °C).

This substance’s standard potential is 1.08 V.

Br2 has an ionisation energy of 1142.7 kJ.mol-1.

It has a stifling and repulsive odour.

Br2’s Applications

It’s commonly utilised in the agricultural industry to make insecticides and pesticides.

Bromine compounds have a wide range of applications as flame retardants. They’re used to make plastic furniture and electronic items less combustible.

Organobromides, a bromine compound, is used in fire extinguishers.

Silver bromide is a widely used chemical in film photography.

Bromine chemicals, such as 1,2-di-bromoethane, are used as anti-knock agents in automobiles.


The bromine molecule is a reddish-brown liquid that is easily evaporable to create gaseous emissions.

Br2 is a linear-shaped structural chemical that is a diatomic molecule with two bromine atoms. Both atoms share an equal quantity of charge since their electronegativity is the same.

Nonpolar atoms are those that form a covalent bond with equal electronegativity.

The Br2 molecule is thus a nonpolar molecule.

So, if you have any queries about Br2’s polarity, feel free to post them in the comments area. We’ll get back to you as soon as we can.

Read more: Structure, Geometry, and Hybridization of CO Lewis

Misha Khatri
Misha Khatri is an emeritus professor in the University of Notre Dame's Department of Chemistry and Biochemistry. He graduated from Northern Illinois University with a BSc in Chemistry and Mathematics and a PhD in Physical Analytical Chemistry from the University of Utah.


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