Formal Charge and Molecular Geometry of NF2-

The video tutorial explains the Lewis structure, bond angles, molecular geometry, and formal charges of NF2-. It begins with counting valence electrons, followed by constructing the Lewis structure by placing the least electronegative element, nitrogen, at the center. The video then covers formal charges, showing that fluorine atoms have a charge of zero, while nitrogen has a charge of minus one. The molecular geometry is discussed, highlighting the bent shape due to lone pairs, with bond angles slightly less than 109.5 degrees. Finally, the AXE notation is used to confirm the bent geometry.

What topics are covered in the video about NF2-?

• Periodic table trends

• Chemical reactions and stoichiometry

• Lewis structure and molecular geometry

• Thermodynamics and kinetics

How many valence electrons are there in NF2-?

• 18

• 20

• 22

• 24

Which element is placed at the center of the NF2- Lewis structure?

• Fluorine

• Oxygen

• Carbon

• Nitrogen

What is the formal charge on each fluorine atom in NF2-?

• +2

• -1

• 0

• +1

What is the formal charge on the nitrogen atom in NF2-?

• +1

• 0

• -1

• -2

What is the molecular geometry of NF2-?

• Linear

• Trigonal planar

• Bent

• Tetrahedral

How do lone pairs affect the bond angles in NF2-?

• They increase the bond angles

• They make the bond angles exactly 120 degrees

• They decrease the bond angles

• They have no effect

What is the approximate bond angle in NF2-?

• 90 degrees

• 109.5 degrees

• 120 degrees

• 180 degrees

In AXE notation, what does 'E' represent for NF2-?

• Number of atoms attached

• Number of lone pairs on the central atom

• Central atom

• Total number of valence electrons

What is the AXE notation for NF2-?

• AX2E2

• AX3E

• AX4

• AX2E