The use of chlorofluorocarbons (CFCs) in airconditioning and...

The use of chlorofluorocarbons (CFCs) in airconditioning and refrigeration systems has been linked to depletion of the ozone layer of the atmosphere. One of the most widely used CFCs, freon-12, has the formula $\mathrm{CF}_{2} \mathrm{Cl}_{2}$. It is now being replaced with a compound that has the formula $\mathrm{CH}_{2} \mathrm{FCH}_{3}$. Draw the dot diagrams for $\mathrm{CF}_{2} \mathrm{Cl}_{2}$ and $\mathrm{CH}_{2} \mathrm{FCH}_{3}$. (Hint: In $\mathrm{CH}_{2} \mathrm{FCH}_{3}$, the carbons bond to each other, and one of them bonds to fluorine.)

The use of chlorofluorocarbons (CFCs) in airconditioning and refrigeration systems has been linked to depletion of the ozone layer of the atmosphere. One of the most widely used CFCs, freon-12, has the formula $\mathrm{CF}_{2} \mathrm{Cl}_{2}$. It is now being replaced with a compound that has the formula $\mathrm{CH}_{2} \mathrm{FCH}_{3}$. Draw the dot diagrams for $\mathrm{CF}_{2} \mathrm{Cl}_{2}$ and
$\mathrm{CH}_{2} \mathrm{FCH}_{3}$. (Hint: In $\mathrm{CH}_{2} \mathrm{FCH}_{3}$, the carbons bond to
each other, and one of them bonds to fluorine.)

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Key Concepts

Valence Electrons

Valence electrons are the electrons in the outermost energy level of an atom that participate in chemical bonding. Counting these electrons accurately for each atom is crucial when constructing Lewis dot diagrams, as they determine how atoms can bond together to achieve stable electronic configurations.

Lewis Dot Structures

Lewis dot structures (or electron dot diagrams) are schematic representations that display the valence electrons of atoms within a molecule. They illustrate how atoms share electrons through bonds and show lone pairs, helping to predict molecular geometry and reactivity.

Octet Rule

The octet rule refers to the tendency of atoms, especially those in the second period of the periodic table, to form bonds in such a way that they each have eight electrons in their valence shell. This rule guides the drawing of Lewis structures and explains the stability of many molecules.

Chemical Bonding

Chemical bonding involves the sharing or transfer of valence electrons between atoms to achieve more stable electron configurations. In the context of Lewis dot diagrams, covalent bonds are depicted as shared pairs of electrons, providing a visual way to understand how molecules are constructed and how atoms interact.

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