Classify:

• elements based on electron configuration.

Compare:

• early and modern periodic tables.

Describe:

• periodic trends for first ionization energy, ionic size, and electronegativity
• the information in a periodic table.
• trends among the elements for atomic size.

Distinguish:

• representative elements and transition metals.

Explain:

• how elements are organized in a periodic table.
• how ions form.

Identify:

• three broad classes of elements.