Chemical Names and
Formulas
Overview
•Metals and Non-Metals
•Ions and Ionic Charges
•Types of Compounds
•Systematic Names
-Writing Names and Formulas
Metals and Nonmetals
Stairway Of Division on Periodic Table
 C, P, Se, I, Rn and to the right are nonmetals
 B, Si, As, Ge, Sb, Te, At are metalloids
 All others are metals

– http://isbchem1.pbworks.com/w/page/9206122/
Semi-Metals_E_Block
Ions
 Cations
 Anions
Positively
Charged
Atoms
Negatively
Charged
Atoms
 i.e.
Na
+
 i.e.
Cl
-
TYPES OF
COMPOUNDS





Ionic Compounds
Ionic means a metal and a non-metal (or cation and anion)
These elements are NOT attached
Writing Formulas
• charges must balance so
compound charge is neutral.
Molecular Compounds
• composed of molecules in which elements share electrons.
• usually composed of 2 nonmetals.
• these elements are attached
CHEMICAL FORMULAS

Definition:
shows the kind and numbers of
atoms in the smallest representative
unit of the substance.
i. e. NaCl
WRITING FORMULAS AND
NAMING IONIC COMPOUNDS
 Writing
Formulas from Names
• 1st word = CATION
• 2nd word = ANION name
with ide ending.
IONIC COMPOUNDS


NaBr
Sodium
MgF2
Bromide
Magnesium
Fluoride
IONIC COMPOUNDS
 Potassium
Chloride
 Aluminum
Oxide
• notice ending
of name is ide!
K
+ Cl-
-> KCl
Al3 + O2- ->
Al2O3
Polyatomic Ions
 Definition:
tightly bound groups of
atoms that behave as a unit
and carry a charge.
Example: SO32-, NO2-, ClO2-
Writing Formulas and Naming
Compounds with Polyatomic
Ions

Ca2 + CO32-> CaCO3
 Ca(NO3)2
 Calcium
Carbonate

Calcium
Nitrate
Naming with Transition
Metals
 First
word = CATION
 Second word = ANION
You need to determine what charge
is on the transition metal if more
than one exists.
Naming Transition
Metals
Copper
Oxide
(I)
Cu2O
Writing Formulas with
Transition Metals
 FeCl3
 Cu2O
 FeCl2
 Iron
(III)
Chloride
 Copper (I)
Oxide
 Iron (II)
Chloride
MORE ABOUT
NAMING COMPOUNDS

Your ability to name compounds
and write formulas hinges on
your ability to recognize whether
a compound is Ionic or
Molecular.
Naming Molecular Compounds
Prefixes are used to show how
many atoms are present in each
molecule.
 mono, di, tri,tetra, penta, hexa,
hepta, octa, nona, deca

Writing Molecular Compounds
 CO2 
Carbon Dioxide
• No mono prefix is used
on first element
• Di means two oxygen
atoms
 S4N2 
Tetrasulfur
Dinitride
Naming Molecular
Compounds
 (prefix
+ element name + root -ide)
* No mono prefix is used on first element
* The Greek prefixes for 1 through 8 are:
mono-, di-, tri-, tetra-, penta-, hexa-, hepta-, octo-
i. e. CO2
i.e. N2O
i.e. PCl3
Carbon Dioxide
Dinitrogen Monoxide
Phosphorous Trichloride