How to Draw the Lewis Structure of SO2 (Sulfur Dioxide)

TL;DR

To draw the Lewis structure of sulfur dioxide (SO2), start with 18 valence electrons and identify the highest multiple of eight just under that, which is 16. The most stable structure minimizes the formal charge on sulfur, leading to a bent geometry due to a lone pair on the sulfur atom. SO2 is polar because of the dipole moments from the more electronegative oxygen atoms.

Transcript

in this lesson we're going to talk about how to draw the lewis structure of so2 sulfur dioxide so let's begin by counting the valence electrons in this molecule so this molecule has one sulfur atom and two oxygen atoms both of these elements are found in group six a of the periodic table and they each therefore have six valence electrons so it's go... Read More

Key Insights

• 💁 SO2 has 18 valence electrons and can be drawn with a variety of resonance forms.
• 😘 The Lewis structure with the lowest formal charge on sulfur is considered the most stable.
• 💁 Sulfur can have an expanded octet and can form more than eight electrons in its valence shell.
• 🫀 SO2 has a bent molecular shape due to the presence of a lone pair on the central sulfur atom.
• 🔺 The bond angle in an SO2 molecule is approximately 120 degrees.

Questions & Answers

Q: How many valence electrons does sulfur dioxide (SO2) have?

SO2 has a total of 18 valence electrons, considering the sulfur and two oxygen atoms.

Q: Why is the Lewis structure of SO2 considered to have a bent molecular shape?

The presence of a lone pair on the central sulfur atom causes repulsion, resulting in a bent molecular shape.

Q: How do you determine the formal charge on an atom in a Lewis structure?

The formal charge is calculated by subtracting the number of bonds and lone pairs from the number of valence electrons.

Q: Is SO2 a polar or nonpolar molecule?

SO2 is a polar molecule because it possesses a net dipole moment due to the unequal sharing of electrons between sulfur and oxygen.

Summary & Key Takeaways

• SO2 is composed of one sulfur atom and two oxygen atoms, with a total of 18 valence electrons.

• To draw its Lewis structure, identify the highest multiple of eight just under 18 (which is 16).

• The most stable Lewis structure minimizes the formal charge on sulfur, which can have an expanded octet.

• The Lewis structure of SO2 has a bent molecular shape due to the lone pair on the central sulfur atom.