PCl6- Ion Structure and Properties

The video tutorial explains the Lewis structure for the PCl6- ion. It begins by identifying the total number of valence electrons and selecting phosphorus as the central atom due to its lower electronegativity. The tutorial then demonstrates how to draw chemical bonds between phosphorus and chlorine atoms, using lines to represent shared electron pairs. It ensures that all chlorine atoms achieve octets and explains that phosphorus can have an expanded octet because it is below Period 2 of the periodic table. Finally, the video shows how to represent the ion with brackets and a negative charge to indicate its ionic nature.

How many total valence electrons are present in the PCL6- ion?

• 42

• 48

• 36

• 54

Which atom is placed at the center of the PCL6- Lewis structure?

• Nitrogen

• Oxygen

• Chlorine

• Phosphorus

How many valence electrons are used to form chemical bonds in the PCL6- structure?

• 12

• 10

• 16

• 14

What is the significance of completing octets for chlorine atoms in the PCL6- structure?

• It stabilizes the molecule.

• It increases the molecule's reactivity.

• It changes the molecule's charge.

• It decreases the molecule's size.

Why can phosphorus have more than eight valence electrons in the PCL6- structure?

• It is in Period 4 of the periodic table.

• It is in Period 3 of the periodic table.

• It is in Period 2 of the periodic table.

• It is in Period 1 of the periodic table.

What notation is used to indicate that PCL6- is an ion?

• Brackets with a negative sign outside

• A positive sign outside the brackets

• No special notation is needed

• A negative sign inside the brackets