Steric Number and Molecular Geometry

The video tutorial explains how to find the steric number for the nitrate ion (NO3-). It begins with the importance of having a valid Lewis structure, followed by identifying the number of atoms bonded to the central nitrogen atom and counting the lone pairs. The steric number is determined to be 3, leading to the conclusion that the molecular geometry of NO3- is trigonal planar.

What is the first step in finding the steric number for NO3-?

• Drawing a valid Lewis structure

• Counting the lone pairs on the central atom

• Identifying the molecular geometry

• Calculating the bond angles

How many atoms are bonded to the central nitrogen atom in NO3-?

• One

• Two

• Four

• Three

What is the steric number of NO3-?

• 2

• 5

• 3

• 4

Why are there no lone pairs on the central nitrogen atom in NO3-?

• Nitrogen cannot have lone pairs

• All electrons are involved in chemical bonds

• Lone pairs are shared with other atoms

• Lone pairs are present but not counted

What role do lone pairs play in determining the steric number?

• They are only considered in molecular geometry

• They decrease the steric number

• They increase the steric number

• They do not affect the steric number

What is the molecular geometry of the nitrate ion?

• Tetrahedral

• Bent

• Trigonal planar

• Linear

How does the absence of lone pairs affect the molecular geometry of NO3-?

• It causes a tetrahedral shape

• It leads to a trigonal planar shape

• It results in a bent shape

• It makes the geometry linear