Periodic Table

Periodic Table

• The periodic table was organized by a Russian scientist named Dmitri Mendeleev.

• He organized the elements based on periodic, or repeating, chemical and physical properties.

Columns

• Columns of elements are called groups or families and have similar properties.

• These properties are similar because they all have the same number of valence electrons (electrons in their outer shell).

• Elements in the the far right column, family or group 18, are called noble gasses.

• These gasses, also called inert gasses, are very non-reactive with other elements.

Rows

• Rows of elements are called periods and change from active metals on the left to inactive gasses on the right.

• Elements in the same row have the same number of electron shells.

Staircase

• Elements to the left of the staircase are metals.

• Elements to the right of the staircase are non-metals.

• Elements next to the staircase line are called metalloids and have properties of both metals and non-metals.