Lewis Structure and VSEPR

Question 1

What are some exceptions to the Octet Rule and what are their max number of valence electrons?

Answer 1

H - 2
He - 2
Li - 2
Be - 4
B - 6

Question 2

What is a free radical?

Answer 2

An atom, molecule, or ion with uneven number (unpaired) valence electrons.

Question 3

When drawing a lewis structure which atom is usually in the center?

Answer 3

The atom with the lowest electronegativity.

Question 4

What does more electron delocalization in a molecule lead to?

Answer 4

Increased stability

Question 5

What are the 3 popular types of hybridized orbitals and what kind of bonds do they each have?

Answer 5

sp3 - sigma bonds
sp2 - double bonds
sp - triple bond or 2 double bonds

Question 6

What does VSEPR stand for and what is it used for?

Answer 6

Valence shell electron pair repulsion theory and it is used to predict the geometry of molecules from the number of electron pairs surrounding their central atoms.

Question 7

What do more electron pairs do to the angles between atoms?

Answer 7

It makes the angles smaller

Question 8

What are some important molecular geometries to know and what are their angles in degrees?

Answer 8

Bent - 104.5 
Trigonal Pyramidal - 107
Tetrahedral - 109.5
Trigonal Planar - 120
Linear - 180