What are binary compounds
compounds that consist of atoms of 2 elements
(mostly a metal and a non-metal)
How do you name a binary ionic compound?
- name the metal ion first, then the non-metal
- if the metal is a TRANSITION METAL, it can have more than one charge (roman numerals in brackets after the name of the metal to indicate charge)
- the suffix of the non-metal is changed to ide (ex. oxygen –> oxide)
example: Fe2O3
~ Iron (III) oxide
example: Ca (NO3)2
~ calcium nitrate
example: AuCl3
~ Gold (III) chloride
What’s a binary molecular compound?
compounds that are made up of 2 nonmetals
ex: CO2
~ carbon dioxide
How do you name a binary molecular compound?
- name the element with the lower group # first
- exception: if oxygen is combined with a halogen (group 7) then the halogen is named first
- name of the 1st element is unchanged
- add ide to the suffix of the second element
- if there are two or more atoms of the first atom, indicate the # of atoms
- always add a prefix to the second element to show the # of atoms
ex: N2O4
~ dinitrogen tetroxide
ex: SF6
~ Sulfur hexafluoride
ex: PCl5
~ phosphorus pentachloride
What’s the family of 4 for polyatomic ions?
CIO4 - = perchlorate
CIO3 - = chlorate
CIO2 - = chlorite
CIO - = hypochlorite
~ look at notebook for more details and practice
What does the prefix thio mean?
it means that an oxygen in the compound has been replaced by a sulfur atom
EX: SO4 ^2- is Sulphate
~ S2O3 ^2- = thiosulphate
~ S2O2 ^2- = thiosulphite
how would u name the following:
a) HPO4 ^ 2-
b) H2PO4 ^-
a) hydrogen phosphate
b) dihydrogen phosphate
What’s a peroxide?
An oxygen ion that will only bond with group 1 elements
ex: Fr2O2
~ francium peroxide
