notes bonding do now ◦ element: simplest form of matter ◦ compounds: when 2 or more elements...
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NOTES
BONDING
Do Now
◦Element: simplest form of matter
◦Compounds: when 2 or more elements chemically combine
What is a chemical bond?
◦Define: A force that holds elements/atoms together.
◦How does it form? When elements bond through sharing/transferring electrons, they form compounds.
There are 3 types of bonds:
◦1. Ionic
◦2. Covalent
◦3. Metallic
◦We will discuss the first 2 types in class.
Ionic Covalent
Definition:- Attraction between oppositely charged ions (electrons are transferred).
Definition:- A bond formed when 2 atoms share electrons.
Ionic Covalent
Formed with?-Active metal/nonmetal
-IMN
Formed with?-nonmetal/nonmetal
-CNN
Ionic Covalent
Na Cl
Na + Cl -
NaCl
H H H H
H2
METAL
NON METAL
NON METAL
Ionic Covalent
IMN
Ionic Metal to Nonmetal
CNN
Covalent Nonmetal to Nonmetal
Is it Ionic or Covalent Bonding?
◦ CH4
covalent
C = nonmetal H = nonmetal
Is it Ionic or Covalent Bonding?
◦H2O
covalent
O = nonmetal H = nonmetal
Is it Ionic or Covalent Bonding?
◦O3
covalent
O = nonmetal
Is it Ionic or Covalent Bonding?
◦ KCl
ionic
K = metal Cl = nonmetal
Is it Ionic or Covalent Bonding?
◦O3
covalent
O = nonmetal
Why does bonding occur?
◦Every element on the periodic table wants to be stable or ‘happy’
Why does bonding occur?
◦Having 8 electrons in the outer energy level makes it stable.
Why does bonding occur?
◦Elements with 8 valence electrons are ‘happy’/stable and don’t react with other elements.
Why does bonding occur?
◦Noble Gases are chemically stable..
Why does bonding occur?
◦Exceptions to the rule are: Hydrogen only needs 2 valence electronsHelium only needs 2 valence electrons