unit 4 chemical bonding and nomenclature Flashcards
what is a chemical bond?
mutual electron w nuclei and valance electrons
metallic bonds
+
METAL + METAL electrons shared equally and non directly between atoms
types
ionic bonds
METAL + NONMETAL one or more electron is transfered between atoms
covalent bonds
NONMETAL + NONMETAL one or more electron is shared between atoms
non polar convalent bond
small difference electrons almost shared equally
less that 0.5
polar covalent bond
larger different electrons shared unequally
greater than 0.5 but less that 1.7
ionic bond
much larger difference electrons not shared but but are transferred
greater than 1.7
propeties of covalent bonds
- no conductivity
- solubility depends on polarity
- low melting/ boiling points
- soft and dull in color
single bond
has 2e- longest and weakest
double bond
has 4e- and medium lengh and strengh
triple bond
has 6e- shortesst and strongest
octet rule
the tendency of atoms to prefer to have eight electrons in the valence shell
exeptions to the octet rule
Helium (H) 2e-
Beryllium (Be) 4e-
Boron (B) 6e-
VSEPR theory
V valance
S shell
E electron
P pair
R repulsion
idea that molecules form disticnt shape based on how many electron domai
ionic compounds combined
made of positve and negative ions that are combined so that the numbers 0f positive and negative charges ae neutralized
equation
