Phosphorus Fluoride Molecular Geometry

The video tutorial explains how to draw the Lewis structure for phosphorus trifluoride (PF3). It begins by counting the total number of valence electrons using the periodic table, identifying phosphorus and fluorine's valence electrons. The tutorial then guides viewers through placing the least electronegative atom, phosphorus, in the center and arranging fluorine atoms around it. It explains forming chemical bonds by placing electron pairs between atoms and completing the octets for each atom. Finally, the video discusses the molecular geometry of PF3, highlighting its trigonal pyramidal shape due to the lone pair of electrons on phosphorus.

How many valence electrons does phosphorus have in the PF3 molecule?

• 3

• 9

• 5

• 7

What is the total number of valence electrons in PF3?

• 18

• 26

• 28

• 24

Which atom is placed at the center of the PF3 Lewis structure?

• Nitrogen

• Phosphorus

• Oxygen

• Fluorine

How many pairs of electrons are used to form bonds between phosphorus and fluorine in PF3?

• 3

• 4

• 2

• 1

After completing the octets for fluorine atoms, how many valence electrons are left for phosphorus?

• 6

• 4

• 2

• 0

What is the molecular geometry of PF3?

• Tetrahedral

• Trigonal Pyramidal

• Trigonal Planar

• Linear

What effect does the lone pair on phosphorus have on the molecular shape of PF3?

• It pushes the fluorine atoms down.

• It makes the molecule linear.

• It has no effect on the shape.

• It makes the molecule planar.