Question

The electronegativity of elements helps in predicting

• A. strength of the element
• B. polarity of the molecule
• C. size of the molecule
• D. valency of the element

Answer 1

Answer: (B)

polarity of the molecule

Answer 2

The electronegativity of elements helps in predicting polarity of the molecule. If the electron egativities are equal (or difference is 0) the bond is non-polar covalent. If the difference in electron eg activities between the two atoms is $> 0$ but $< 2.0$ then the bond is polar-covalent. If the difference in electron eg activities between the two atoms is $2.0$ or greater, the bond is ionic.