Is Cl2 Polar or Nonpolar?

Why is Cl2 Nonpolar?

Chlorine gas consists of two identical chlorine atoms sharing a single covalent bond. Since both atoms have the same electronegativity (3.16), electrons are shared equally, no partial charges form, and the molecule has a dipole moment of 0 D.

• Symmetric linear geometry (180°): The atoms are arranged symmetrically around the central atom. This forces all bond dipoles to point in directions that cancel each other out exactly.
• Weak bond polarity: The small electronegativity difference (0.00) between Cl and Cl produces only weakly polar bonds, and the symmetric geometry cancels even these.
• Zero net dipole (0 D): Because all bond dipoles cancel, the net dipole moment is 0 D. Any molecule with zero net dipole moment is classified as nonpolar.

Molecular Geometry of Cl2

Cl2 has a linear molecular geometry with a bond angle of 180°. Here is why this shape determines polarity:

• The linear arrangement places all outer atoms at equal angles (180°) from the central atom, creating perfect spatial symmetry.
• Each bond dipole has an equal and opposite counterpart — they cancel in pairs, leaving no net charge separation.
• Symmetry is the key: even if the individual bonds are polar, the linear geometry ensures a net dipole of 0 D.

Electronegativity and Polarity

Electronegativity measures how strongly an atom attracts bonding electrons. A difference greater than ~0.5 on the Pauling scale generally means the bond is polar.

In Cl2:

• Cl (central atom) electronegativity: 3.16
• Cl (outer atom) electronegativity: 3.16
• Difference: 0.00 — below the ~0.5 threshold, so the Cl–Cl bonds are only weakly polar

With a small electronegativity difference (0.00) and a symmetric linear geometry, Cl2 is nonpolar with a net dipole of 0 D.

Is Cl2 Polar or Nonpolar? (Quick Answer)

Cl2 (Chlorine) is nonpolar. Cl2 is a nonpolar molecule because both chlorine atoms are identical and share their electrons equally with no net dipole.