Ionic Nomenclature
Lesson 7
Nomenclature
• a branch of taxonomy concerned with the
application of scientific names to taxa,
based on a particular classification scheme
and in accordance with agreed international
rules and conventions
IUPAC nomenclature
• is a system of naming chemical
compounds and for describing the science
of chemistry in general. It is maintained by
the International Union of Pure and Applied
Chemistry.
Ionic Binary Compounds:
IUPAC Naming
• Metal non-metal -ide
Ionic Binary compounds
• A binary compound is one that only contains
two elements in the compound. It may have
multiple atoms of each element but can only
have two elements.
• An ionic binary compound is a compound
contains one metal and one non-metal. Either
element may have multiple atoms but there can
only be the two elements involved.
Ionic Binary Compounds: IUPAC
Naming
• Consists of two types of monoatomic ions
1. The metal ion is always written first and
retains its whole name
2. The non-metal is written second and has a
slight change, the ending (suffix) is changed
to –ide
• Do not write ones (Ex Na1Cl1) and if both
elements have the same number reduce to
lowest terms (Ca2O2 = CaO)
Example
Example:
• Na + Cl
• Use the cross over method Na+ Cl- = NaCl
• sodium + chlorine
• The metal name is written in full and the
non-metal has the –ide suffix added to it.
•
Sodium chloride
• Binary compounds can be made up of more
than two ions, provided that there are only
two types of elements. Example: Al2O3
• STUDY TIP: All metals in group 1 and 2
follow periodic law. Check all the others
metals when naming.
Practice
• Work on the problems given on the sheet.
Ionic Multivalent Binary
Compounds
• A multivalent compound is one that may
have varied numbers of electrons in its
valence shell. This occurs with elements
that fall outside of the representative
elements. The transition metals are elements
that commonly have multiple valence shell
electrons.
• This means that they can form compounds
in various proportions.
• Example:
Copper + Oxygen
• Copper and oxygen could have two
different formulas with two completely
different properties.
• CuO and Cu2O
• In order to differentiate the two compounds
we must use a different method to name
them to avoid confusion.
Ionic Multivalent Binary
Compounds: IUPAC Naming
•
• Metal (charge) non-metal-ide
Ionic Multivalent Binary
Compounds: IUPAC Naming
• Same as Ionic Binary but it indicates the metals
charge
1. List the metal name first
2. After the metal name indicate the ion charge in
brackets using roman numerals.
3. The non-metal has -ide suffix added.
• Do not write 1’s and reduce when possible
• ONLY SHOW ROMAN NUMERALS
FOR MULTIVALENT COMPOUNDS
• Not all transition metals are multivalent and
thus do not have roman numerals
Example
• SnO2  Sn2+ O- Sn4+O2-  tin (IV) oxide
• SnO  Sn+ O- Sn2+O2-  tin (II) oxide
• Work on the practice questions,
• They are homework
• The Worksheet will be handed in