Home ] AP Chemistry ] Chemistry I ] What's New ] Curriculum Vitae ] If You Need Me To Write A Letter Of Recommendation ]

Topic 2 – Atoms, Molecules, and Ions

Download full set of notes for Topic 2 (MS Word 2000)

ATOMIC THEORY OF MATTER
Dalton’s atomic theory
Atomic theory explains the three basic laws of chemistry.
HISTORY OF THE STRUCTURE OF THE ATOM
Early atomic theory Democritus
Modern atomic theory - “Hard Sphere” model Dalton
“Plum Pudding” model Thomson
Nuclear atom - “Solar System” model Rutherford
Bohr model Bohr
Quantum mechanical model Schroedinger
COMPONENTS OF THE ATOM
Electron
Proton
Neutron
Differences in the numbers of components
Key terms related to components of atoms
Atomic number
Element
Mass number
Isotope
Nuclide
Definition
Nuclide symbol
Writing nuclide symbols
Analyzing nuclide symbols
ATOMIC MASSES (sometimes called “atomic weights”)
History of atomic mass
Determined by mass spectrometry
Key terms   
Definition of atomic mass unit
Definition of percent abundance
Definition of fractional abundance
Definition of atomic mass for an element
Calculating atomic masses
Using fractional abundance
Using percent
PERIODIC TABLE
 History of its development
Doebereiner - “triads”  1817
Newlands - “Law of Octaves”  1864
Mendeleev - “Periodic Table”  1869
Moseley - the “Atomic Number Periodic Table”  1913
The modern periodic table
The periodic law
The periodic table is an arrangement according to properties in order of increasing atomic number.
Periods and Groups
Important parts of the periodic table
Group names
Representative elements and transition elements
Metals, nonmetals, and metalloids
CHEMICAL FORMULAS
Chemical formulas use atomic symbols
Chemical formulas use subscripts
MOLECULAR SUBSTANCES
 Molecules
Formulas for molecular substances
IONIC SUBSTANCES
Definition of ionic substance
Ions
Definition of an ion
Ions can be categorized by the number of atoms that formed the ion.
Ions can be categorized by their charge.
Formula units
PREDICTING THE CHARGES ON MONOATOMIC IONS
Metals in Groups IA, IIA, and IIIA
Nonmetals in Groups VA, VIA, and VIIA
Group B metals
Group IVA metals
Group IVA nonmetals and the noble gases
NAMING IONS
Monoatomic ions
Polyatomic anions including oxyanions
WRITING IONIC FORMULAS
When given the ionic symbols
When given the names of the ions
NAMING IONIC COMPOUNDS FROM THE FORMULA
BINARY COMPOUNDS
Definition of binary compound
Two types of binary compounds
Ionic
Covalent - also called “binary molecular compounds”
WRITING THE FORMULAS FOR BINARY MOLECULAR COMPOUNDS
NAMING BINARY MOLECULAR COMPOUNDS
NAMING ACIDS
Binary acids of the form HaX 
Oxyacids
HYDRATES
Definition
Naming a hydrate
WRITING CHEMICAL EQUATIONS
Definitions
Chemical equation
Reactant
Product
Subscript
Coefficient
Procedure
BALANCING CHEMICAL EQUATIONS
Rules
Techniques for balancing equations by inspection