Lewis structures Flashcards
How to draw lewis structures
write the atoms
Draw valence e
check for charge
make single bonds
check octet rule
Add multiple bonds if needed
central atom is the least electronegative but NEVER H
How many e can H hold max
2 e
How many e can B hold max
6 e
The atoms below period 2 can
have more than 8 e
FC formula
FC= valence e - # bonds - # Lone e
where does charge go
central atom
noble gases and electronegativity
noble gases are the least electronegative
REMINDER
PUT CHARGE WHEN DRAWING ANIONS AND CATIONS
Most polar happens
when we have the most difference in electronegativity or farther \way from each other in the periodic table and of them is electronegative
bond order formula
bonds/#atoms
bond properties covalent trends
more internuclear distance, higher energy, more unstable
less internuclear distance, lower energy, less unstable
the more bonds
the tighter the internuclear distance is, the shorter the length, the stronger the bond and requires more energy to break so bond dissociation energy goes up
Bond dissociation energy
how much energy needed to break a bond
