Lewis Structures and Valence Electrons

This video tutorial explains how to write the Lewis structure for the SF5+ ion. It begins by counting the valence electrons, considering the positive charge, and calculating a total of 40 valence electrons. The sulfur atom is placed at the center due to its lower electronegativity compared to fluorine. Five fluorine atoms are arranged around sulfur, and electrons are distributed to form bonds and complete octets. The video highlights that sulfur can have an expanded octet, accommodating more than eight electrons. The final structure is presented with brackets and a positive sign to indicate the ion's charge.

What is the first step in writing the Lewis structure for the SF5+ ion?

• Draw the skeletal structure

• Identify the central atom

• Count the valence electrons

• Determine the molecular geometry

How many valence electrons does sulfur contribute in the SF5+ ion?

• 10

• 4

• 8

• 6

What does the positive charge in SF5+ indicate?

• A neutron has been removed

• An extra electron is present

• A proton has been added

• An electron has been lost

How many total valence electrons are there in the SF5+ ion?

• 42

• 44

• 40

• 38

Which atom is placed at the center of the SF5+ Lewis structure?

• Nitrogen

• Oxygen

• Fluorine

• Sulfur

Why is sulfur chosen as the central atom in the SF5+ ion?

• It has the smallest atomic radius

• It is the most electronegative

• It has the highest atomic number

• It is the least electronegative

What is the purpose of distributing electrons around the atoms in a Lewis structure?

• To calculate the molecular weight

• To complete the octets

• To determine the molecular shape

• To balance the equation

How many valence electrons does each fluorine atom have in the SF5+ ion?

• 9

• 8

• 7

• 6

What is an expanded octet, as seen in the SF5+ ion?

• When an atom has 10 electrons

• When an atom has more than 8 electrons

• When an atom has less than 8 electrons

• When an atom has exactly 8 electrons

What is the final step in drawing the Lewis structure for the SF5+ ion?

• Adding a negative sign

• Changing the central atom

• Removing extra electrons

• Placing brackets around the structure