1. UNIT B
Ionic and Covalent naming of compounds

2. A few things to know
The periodic table organizes the elements by vertical columns (___________) and horizontal rows (______________).
The elements are arranged depending on the chemical and physical properties of elements in repeated patterns and increasing atomic masses.
Element symbol: The first letter is always in upper case and the second letter (if present) is always lower case.
Ex: Sodium (Na), Nitrogen (N)
Groups/familes- they tell you about charges
Horizontal= periods.

3. PERIODIC TABLE
pdf

4. IV.2 NAMING INORGANIC COMPOUNDS
METALS:
Found on left side in periodic table
Form _________ ions
Cation: an ion with a positive charge
NON-METALS:
Found on right side in periodic table
form __________ ions
(H is an exception)
Anion: an ion with a negative charge

5. NAMING MONATOMIC METAL IONS
Simply use the name of the metal and add the word “ion”
Element Name Ion Name
Sodium Metal(Na)
Aluminum (Al)
Write the names of the following ions:
a) Cu+
b) Ag+

6. NAMING MONATOMIC METAL IONS
If a metal has more than one possible charge, the charge has to be indicated by a Roman numeral, in parenthesis, immediately following the name.
Ex: Fe+3
Fe+2
Roman numerals are:
I V IX
II VI X
III VII 7
IV VIII 8

7. NAMING MONATOMIC METAL IONS
Write the formula of the following ions to show their charges:
Uranium (VI) ion = __________
Iron (II) ion = __________
Nickel (II) ion = __________

8. NAMING MONATOMIC NON-METAL IONS
Take off the original ending and add an “ide” ending.
Element Name Ion Name
Florine (F) 
  Sulphur (S) 
Write the names of the following ions:
a) Br- = __________________________
b) Cl- = __________________________
c) I- = __________________________
d) O-2 = __________________________
e) N-3 = __________________________

9. Naming Polyatomic Ions:
The names do NOT CHANGE.
Use it exactly as you find it in your data booklet
As simple as that
THE END

10. How to write the formula and how to write the name of
Ionic Compounds

11. HOW TO WRITE THE FORMULA OF IONIC COMPOUNDS
An ionic compound
A compound made up of ions ( usually a metal + non-metal )
The ions have charges but the compound is a neutral molecule.
remember in ionic compounds , one ion loses and one ion gains electrons).
The chemical name of an ionic compound always gives the positive ion (cation) first and the negative ion (anion) second.
Ex: NaCl is Sodium Chloride

12. 3 SIMPLE RULES

13. WRITING FORMULA OF IONIC COMPOUNDS

14. MORE EXAMPLES Potassium oxide: Iron (II) sulphate: Tin (IV) oxide:
Calcium phosphide
We do not change the endings of polyatomic ions because they already have special endings that end in “ate” or “ite”

15. How to Write the Name of an IONIC COMPOUND
Check your periodic table to see if the positive ion has more than one ion charge.

16. How to Write the Name of an IONIC COMPOUND
A) If the first ion has only one possible ion charge:
ZnCl2
MgO
Ag2SO4

17. B) If the first ion has more than one possible charge:
“De-swap and de-drop” the subscripts (to find out the real charge)
check the charge on negative ion (if it is not as what it should be, you probably need to double or triple it)
write the charge of the positive ion with roman numerals
Write the charge of the negative ion with “ide”

18. TRY THESE ON YOUR OWN
FeS
Fe2(HPO4)3

19. PRACTICE TIME!

20. How to write the formula and how to write the name of
LESSON 2
How to write the formula and how to write the name of
Covalent Compounds

21. Naming COVALENT COMPOUNDS Using the Prefix-Naming System
Remember covalent compounds SHARE their electrons ( usually two non-metals together).
Binary Compound: a compound made of two different types of atoms (usually two non-metals)
SO2, Na2S, NaCl
Tertiary Compound: a compound made of three different types of atoms.
H2SO4 KOH KMnO4

22. Naming COVALENT COMPOUNDS Using the Prefix-Naming System
We use the prefix-naming system
1- Each compound name is made of words, each with a suitable prefix

23. Naming COVALENT COMPOUNDS Using the Prefix-Naming System
Prefix-system naming continued
First word is the name of element with a prefix to indicate the # of atoms
Second word is the name of the element with an “ide” ending and a prefix to indicate the # of atoms
P2S3 = diphosphorus trisulphide
Exception: if there is only ONE atom of the first element, don’t use the prefix mono.
Ex: CO2 =

24. TRY ON YOUR OWN
Examples:
P2S3 =
CO =
BrCl3 =
S2Cl2 =

25. PREFIX NAMING SYSTEM
Basically used when you have two different Non- Metals.
Non-metals are usually found on the right side of the periodic table.
Remember the prefixes.

26. WRITING FORMULAS FOR COVALENT COMPOUNDS
Steps:
Write down the symbol for each element
Use the prefix to determine the number of atoms of each element.
Example: dinitrogen tetroxide carbon dioxide
Do NOT reduce !

27. First identify if it is ionic or covalent Ionic compounds
Naming
First identify if it is ionic or covalent
Ionic compounds
Metal and non-metal
Positive ion first then negative ion
Use roman numerals to indicate the ions with more than one possible charge
For the negative ions(non-metals) change the ending to ide.
Covalent compounds
Non-metal and non-metal
For both, we use the prefix-naming system (mono, di, tri, tetra, etc)
First one, you just write the element’s original name with prefix
You change the second element’s name to “ide” with prefix.
SUMMARY

28. SUMMARY Writing Formulas First identify if it is ionic or covalent
Ionic compounds
Write formula for positive ion first then negative ion
Swap and drop charges as subscripts
Reduce if you need to.
Covalent compounds
Write down the symbol for each element
Use the prefix to determine the number of atoms of each element.
Do NOT reduce !

29. PRACTICE TIME!