Lewis Structures and Valence Electrons

This video tutorial explains how to write the Lewis structure for the SF3- ion. It begins by counting the valence electrons of sulfur and fluorine, noting the extra electron due to the negative charge. The tutorial then guides viewers through placing sulfur at the center and arranging fluorine atoms around it. It explains forming chemical bonds and completing the octets of fluorine atoms. The video also covers adding extra electrons to sulfur, allowing for an expanded octet, and concludes with the proper notation for the ion, including brackets and a negative sign.

How many valence electrons are present in the SF3- ion?

• 24

• 28

• 32

• 26

Which atom is placed at the center of the SF3- Lewis structure?

• Nitrogen

• Oxygen

• Sulfur

• Fluorine

How many fluorine atoms are arranged around the central sulfur atom in SF3-?

• Two

• Three

• One

• Four

What is the purpose of placing a pair of electrons between atoms in the Lewis structure?

• To increase electronegativity

• To complete the octet

• To form a chemical bond

• To reduce the charge

How many valence electrons does the central sulfur atom have in the SF3- structure?

• 10

• 8

• 6

• 12

Why is it acceptable for sulfur to have more than 8 valence electrons in SF3-?

• Because it can have an expanded octet

• Because it is a noble gas

• Because it forms ionic bonds

• Because it is highly electronegative

What should be added to the Lewis structure to indicate that SF3- is an ion?

• A single bond

• A double bond

• A positive sign

• Brackets and a negative sign