Valence Electrons in PBr3 Molecule

Dr. B explains how to draw the Lewis structure for PBr3. Phosphorus has 5 valence electrons, and each of the three Bromines has 7, totaling 26 valence electrons. The structure is built by placing Phosphorus in the center and surrounding it with Bromines, forming bonds and ensuring each atom achieves an octet. The final structure is verified by checking formal charges, which are all zero, confirming the best structure for PBr3.

How many valence electrons does Phosphorus have in the PBr3 molecule?

• 8

• 7

• 5

• 3

What is the total number of valence electrons in the PBr3 molecule?

• 30

• 26

• 21

• 18

How many pairs of electrons are initially placed between Phosphorus and each Bromine to form bonds?

• 4

• 3

• 2

• 1

After forming bonds, how many valence electrons are left to distribute on the Bromine atoms?

• 26

• 24

• 20

• 18

Where are the remaining valence electrons placed after completing the octets for Bromine?

• On the outer Bromine atoms

• On the central Phosphorus atom

• They are not used

• In the form of a double bond

What is the formal charge on each atom in the completed PBr3 Lewis structure?

• +1

• 0

• +2

• -1