Bell Ringer How do we know how many valence electrons an atom has? What happens during ionic bonding? What is holding an ionic molecule together? What 2 classes of elements are involved in an ionic bond?
Jan 18, 2018
Bell RingerHow do we know how many
valence electrons an atom has?What happens during ionic
bonding?What is holding an ionic molecule
together?What 2 classes of elements are
involved in an ionic bond?
Covalent BondingChapter 6.2 a
Chemical Bonding Ionic Bond – Force that holds cations
and anions together and which involves the transfer of electrons. Occurs between a metal and a nonmetal.
Chemical BondingWhat do you think will happen
when 2 nonmetals bond?Will there be a transfer of electrons?
Why?
FF
Covalent BondingWhen two nonmetals meet - one atom is
NOT strong enough to take electrons from the other! So they must share them Covalent Bond!
Covalent bond - is a chemical bond in which two atoms share one or more pairs of valence electrons.
Covalent BondingElectrons want to be in pairs – 4
pairs of 2 to fulfill the octet rule.
Paired electrons are ‘happy’!Unpaired electrons are ‘sad’
How it Works
+
How it works!
Sharing Creates a Bond
F F
Outer Level Still only hold 8!!!!
Electron Configuration & Lewis Dot Structures
All 3 figures represent the same thing!BAR = Bond of shared electrons
F F
F F F F
Diatomic means “two atoms”.
Atoms of same element share bonding electrons equally.
Balanced
Covalent Bonds
The Halogen H-O-N-ies The diatomic 7
F Cl Br I H O N
Covalent Bonds
Halogens
H-O-N-ies
Single Bond
FFF F OR
Each atom now “Feels Like” it has 8 valence electrons!
Single Bond =
• One Pair of e- Shared Between Two Atoms.• Each atom gives one e- to the shared pair
How Will These Two Bond?
Oxygen and Oxygen
O O
Double Bond
OR
•Two Pairs of Electrons are Being Shared•Each atom gives one e- to each shared pair
O O
O O
How Will These Two Bond?Nitrogen and Nitrogen
N NN
Triple Bond
OR
• Three Pairs of Electrons Being Shared
N N
N N
PracticeNCl3AsF3CF4CF2Cl2GeH4SiS2CH2OHSiNCSF2C2Br2
PracticeC2H6C2H4C2H2C3H8C3H4