Respuesta :
polarity is a separation of electric charge leading to a molecule or its chemical groups having an electric dipole or multipole moment. Polar molecules must contain polar bonds due to a difference in electronegativity between the bonded atoms.
Explanation:
When two atoms of different electronegativities are combined together then more electronegative atom attracts the valence electrons of less electronegative atom.
For example, in a NaCl molecule sodium has a partial positive charge and chlorine has a partial negative charge.
As a result, a partial negative charge will develop on the electronegative atom. And a partial positive charge will develop on the less electronegative atom.
Hence, polarity on a molecule develops.
