Chemical Bonding Flashcards
2 element exceptions to octet rule
Hydrogen and Helium
Bond length and Bond strength in order
LENGTH: single>double>triple
STRENGHT: single<double<triple
Electronegativity vs Electron affinity
Negativity: bonded
Affinity: nonbonded
Most polar molecule
H-F
Most electronegative atoms
Cl, O, N, F
how to write:
- monoatomic cations
- polyatomic cations
- anions
- NO brackets
- W brackets
- W backets
Central Atom Requirements (4)
- Not H
- Less electronegative
- octet followers (C, O, N, F)
- 0 formal charge
what do you call structures will more than 1 possible LEWIS STRUCTURE
and what symbol to signify
Resonance Structures
double-ended arrows
Formula for Formal Charge
of valence e- (MINUS) bonds (MINUS) electrons
RULE for negative formal charges
must be on the MORE ELECTRONEGATIVE ATOM
EN values BOND POLARITY
< 0.5 non polar
0.5 - 1.9 polar
> 1.9 ionic
Electron Pair Geometry VS Molecular
EPG = overall arrangement of all e- groups around central atom
MG = arrangement of bonding pairs around
A X E notation meaning
A - central atom
X - # of bonds
E - # of e- pairs
Sigma vs Pi bonds
S: head-on overlap between adjacent orbitals (hybridized)
P: SIDE-on overlap between adjacent orbitals (non hybridized)
of Sigma and Pi bonds per bond type
Single = 1 Sigma
Double = 1 Sigma & 1 Pi
Triple = 1 Sigma & 2 Pi
