The Periodic Table is arranged in a manner that places elements with similar chemical properties in columns (groups).
This similarity of chemical properties is due to the fact that elements in a group have the same number of electrons in the outermost energy level (called valence electrons). An atom's valence electrons dictate how it will react with other atoms and molecules. This activity underscores this fact and teaches students a simple way to determine valence electrons of elements found in Groups 1,2, and 13-18.
This activity should be completed after students have been introduced to the structure of the atom, the Periodic Table and valence electrons. It serves as a nice warm-up activity.
periodic table - an arrangement of the elements in order of their atomic numbers such that elements with similar properties fall in the same column, or group
valence electron - an electron that is found in an atom's outermost energy level and that determines the atom's chemical properties.
group - a vertical column of elements in the periodic table; elements in a group share chemical properties
period- In chemistry, a horizontal row of elements in the periodic table
chemical bond - an interaction that holds atoms or ions together