Valence Electrons and PCl5 Structure

Dr. B explains how to draw the Lewis structure for PCl5. The video covers the calculation of valence electrons for Phosphorus and Chlorine, placing Phosphorus in the center, and arranging Chlorines around it. It details the process of drawing bonds and distributing electrons to complete the octets for Chlorine and the expanded valence shell for Phosphorus. The video concludes with a check of formal charges, confirming the structure's accuracy.

How many valence electrons does Phosphorus have?

• 8

• 3

• 5

• 7

What is the total number of valence electrons in PCl5?

• 40

• 30

• 45

• 35

Where is Phosphorus placed in the PCl5 structure?

• On the left

• On the right

• In the center

• At the top

How many valence electrons are used in the initial bonding of PCl5?

• 5

• 20

• 10

• 15

What is the total number of valence electrons used after completing the electron distribution?

• 45

• 30

• 35

• 40

Why is it acceptable for Phosphorus to have more than 8 valence electrons?

• It is in period 2 of the periodic table

• It is a noble gas

• It is a metal

• It is in period 3 of the periodic table

What are the formal charges on the atoms in the PCl5 structure?

• All are -1

• All are +1

• All are zero

• Mixed charges