Bell Ringer
Part 1 – Simple Ionic Compounds
Naming Binary Ionic Compounds
- Alkali (Group 1A) and Alkaline Earth Metals (Group 2A)
- Name elements in the order they appear in the chemical formula.
- Format:
Metal
Cation (+)
Normal Element
Name
- Example:
Nonmetal
Anion (-)
Stem of Element
Name + suffix –ide
NaCl  Sodium
Chloride (“Chlor” + -ide)
- Note that the number of ions/atoms in the formula plays no part in the name for
Ionic Compounds
Name to the Formula –
- You must write out the Ions (Na+ Cl -) and do the Criss Cross Method
Part 2 – Transition Metals
Naming Binary Ionic Compounds
- Transition Metals (multiple charges/oxidation #’s)
- Works the same way as the simple Ionic Compounds EXCEPT:
o Parenthesis surrounding the transition metal’s charge/oxidation # in
Roman Numerals is included.
- Format:
Metal
Cation (+)
Normal Element
Name
- Example:
Iron
Copper
(Metal’s Charge)
Roman
Numeral
(III)
(II)
Nonmetal
Anion (-)
Stem of Element
Name + suffix –ide
Oxide
Sulfide
- You must use the Anion’s (nonmetal) charge (it never changes) & the Criss
Cross Method to determine the transition metal’s charge (the Roman Numerals
value).
o Example: Fe2O3  Fe? + O2CuS  Cu? + S2-  Formula was REDUCED
from Cu2S2
o For 1:1 ratios the charge on the metal/cation has to be equivalent to the
charge on the nonmetal/anion
Name to Formula –
- Same as before (Roman Numeral gives you the transition metal’s charge)
Part 3 – Polyatomic Ions
Naming Binary Ionic Compounds
- Polyatomic Ions
- Works the same way as the simple Ionic Compounds EXCEPT:
o You use the given name for the Polyatomic Ion (no changes)
o Include charge (roman numerals) when a transition metal is used.
- Format:
Metal
Cation (+)
(Metal’s Charge)
Normal Element or
Roman
Polyatomic Ion Name Numeral
Polyatomic Ion
Anion (-)
Polyatomic Ion Name
o NH4+ (Ammonium) and H3O+ (Hydronium) are the only polyatomic
cations you know - they will come at the beginning of a chemical
formula.
o Polyatomic Ions mostly end in –ate or –ite.
- Example:
Ca3(PO4)2  Calcium Phosphate
Cu(C2H3O2)2  Copper (II) Acetate [Transition Metal]
(NH4)(NO3)  Ammonium Nitrate
- Like before you must use the Polyatomic Anion’s charge (it never changes) &
the Criss Cross Method to determine a transition metal’s charge (the Roman
Numerals value).
Name to Formula –
- Same as before – Write out the Ions for [Na+ (NO3-)] and do the Criss Cross
Method to determine the formula. Remember the Polyatomic Ions stay
together – they act a single unit.