On the basis of the electronegativity values given in Fig....

On the basis of the electronegativity values given in Fig. 12.3 , indicate whether each of the following bonds would be expected to be ionic, covalent, or polar covalent.
a. $\mathrm{H}-\mathrm{O}$
b. $\mathrm{O}-\mathrm{O}$
c. H-H
d. $\mathrm{H}-\mathrm{Cl}$

Key Concepts

Electronegativity

Electronegativity is a measure of an atom's ability to attract electrons in a chemical bond. It plays a crucial role in determining how electrons are shared or transferred between atoms, influencing the type of bond formed. In comparative terms, differences in electronegativity values between atoms indicate whether a bond will be largely ionic, covalent, or polar covalent.

Ionic Bond

An ionic bond is formed when there is a large difference in electronegativity between the two bonding atoms. In such bonds, one atom donates one or more electrons to the other, leading to the formation of oppositely charged ions that attract each other. Ionic bonds typically occur between metals and non-metals.

Covalent Bond

A covalent bond forms when two atoms, generally with similar electronegativities, share electrons to achieve stability. In a purely covalent bond, the electrons are shared equally between the atoms, resulting in a non-polar bond. This type of bonding is most common among non-metal elements.

Polar Covalent Bond

A polar covalent bond is an intermediate type of bond where the electronegativity difference between the two atoms is moderate. In these bonds, electrons are shared unequally, which creates a dipole moment with partial charges at each end. This polarity affects the physical properties and reactivity of the molecule.

Electronegativity Difference and Bond Classification

The difference in electronegativity between bonding atoms is used as a criterion to predict the type of bond that will form. A large difference often leads to ionic bonds, a small or zero difference results in non-polar covalent bonds, and an intermediate difference gives rise to polar covalent bonds. This concept is fundamental in understanding molecular structures and interactions.

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