Instructional Objectives
3. Atomic Structure and the Periodic Table
3.1 Internal Structure of an Atom
 Summarize the experimental basis for the discovery of charged particles and the nucleus.
 Describe the subatomic particles and how they arranged in the internal structure
of the atom.
 Describe the basic properties of protons, neutrons, and electrons.
3.2 Atomic Number and Mass Number
3.2 Describe and define atomic and mass numbers
 Calculate the number of protons, neutrons, and electrons in any atom.
 Distinguish among atoms, ions, and isotopes.
3.3 Isotopes and Atomic Masses
 Describe isotopes of an element how they affect physical and chemical
properties.
 Describe how an average atomic mass of an element in the periodic table is
calculated.
Chemistry at a Glance: Atomic Structure and how big is an atom?
3.4 The Periodic Law and the Periodic Table
 Describe periodic law and how Mendeleev constructed periodic table fro
elements.
 Describe the modern periodic table and, groups, periods, in the table.
3.5 Metals and Nonmetals
Describe the place of metals, metalloids and nonmetals in the periodic table.
3.6 Electron Arrangements within Atoms
 State the basic postulates of Bohr's theory.
 Describe the first model, the Bohr model of arrangement of electrons in shells
(orbits) around a nucleus of an atom.
 Describe how Bohr models explain absorption and emission of light from atoms.
 Compare and contrast Bohr's theory and the more sophisticated "wave-mechanical"
approach.
 Describe the extension of shell model of to include sub-shells and orbitals.
Chemistry at a Glance: Shell, Sub-shell and Orbital Interrelationships
3.7 Electron Configurations and Orbital Diagrams
 Describe how you obtain atomic electronic configuration for an element in the
periodic table.
 Describe how you obtain ionic electronic configuration for an element in the
periodic table.
 Describe how you obtain atomic and ionic valence shell electronic configurations.
 Describe how you obtain atomic and ionic valence shell orbital diagrams.
3.8 The Electronic Basis for the Periodic Law and the Periodic Table
 Describe how valence electronic configuration is related to periodic law and
arrangement of elements in the periodic table.
3.9 Classification of the Elements
 Use the periodic table to obtain information about an element.
 Describe the classification of elements in the periodic table as representative
elements, transition elements, inner transition elements (lanthanides and
actinides).
Chemistry at a Glance: Describe Element Classification Schemes and the Periodic
Table
Chemical Connections: Describe heat Protium, Deuterium, and Tritium: The Three
Isotopes of Hydrogen; Importance of Metallic and Nonmetallic Trace Elements for
Human Health; Electrons in Excited States