SCH 3U1
The Periodic Table
Learning Goals: To determine the number of valence electrons for
representative elements.
To interpret Bohr-Rutherford diagrams to determine the
period and group numbers.
To understand the structure of the periodic table is based
on atomic number and properties.
Success Criteria: To draw Lewis (dot) diagram for representative elements.
Organization: The periodic table is organized by groups and
periods. The ________ separates the metals
and ____________. See textbook (p.30) for
definitions of alkali metals, alkaline earth metals,
halogens, noble gases, metalloids, transition
metals, representative elements, lanthanides and
actinides.
Bohr-Rutherford: The number of rings in the diagram is the
________ number. The group number (for the
representative elements) is equal to the number
of ___________________.
Lewis dot symbols: Using only the element symbol, the dots will
equal the number of valence electrons (don’t pair
up unless you must).
Eg. H , He , Mg , Ne
Periodic Law: the chemical and physical properties of the
elements repeat in a regular, periodic pattern
when they are arranged according to their
____________________.