![Polyatomic ions
Example: Magnesium Nitrate
1. Look up the formula and charge for nitrate on
polyatomic ion list.
2. Write the symbols of ion and polyatomic ion
Mg NO3
3. Using crossover method determine number of each
ion. Use parenthesis in the formula for polyatomic ions
with a subscript
Mg+2[NO3]-1
Therefore:
Mg(NO3)2](https://image.slidesharecdn.com/namingandwritingcompoundsandmolecules-140325062252-phpapp01/85/Naming-and-writing-compounds-and-molecules-4-320.jpg)
Naming and writing compounds and molecules
- 1. M A R C H 2 4 , 2 0 1 3 Naming and Writing Compounds and Molecules
- 2. Objectives 1. Write formulas for and name ionic compounds 2. Write the formulas for and name covalent molecules
- 3. Writing Ionic Formulas Example: calcium bromide 1. Write the symbols of both ions Ca Br 2. Using the crossover method determine the number of each ion. Ca+2Br-1 Therefore: CaBr2
- 4. Polyatomic ions Example: Magnesium Nitrate 1. Look up the formula and charge for nitrate on polyatomic ion list. 2. Write the symbols of ion and polyatomic ion Mg NO3 3. Using crossover method determine number of each ion. Use parenthesis in the formula for polyatomic ions with a subscript Mg+2[NO3]-1 Therefore: Mg(NO3)2
- 6. Naming Ionic Compounds Example: NaI Write the name of the first ion, add the suffix “ide” to the second ion. Sodium Iodide Polyatomic ion example: NaOH Look up the formula and charge of polyatomic ion. Write name of first ion and name of polyatomic ion Sodium Hydroxide
- 8. Writing Covalent Formulas Example: Dinitrogen tetraflouride 1. Write the symbol of the first and second element N F 2. Numbers are given in greek prefixes, write the subscript that the prefix indicates N2F4
- 10. Naming Covalent Molecules Example: N2S4 1. Write the name of the first element and add the suffix “ide” to the second Nitrogen Sulfide 2. Use greek prefixes to indicate the number of atoms in the formula *do not use mono in the first element * drop o or a in greek prefix if element starts with a vowel Dinitrogen tetrasulfide