Periodic Table Vocabulary

A row in the table of elements.

The average mass of an atom of a particular element. Based on all isotopes.

Elements that form a bridge between the elements on the left and right hand sides of the table.

An arrangement of the elements into columns, based on properties that repeat row to row

An electron that is in the highest occupied energy level of an atom. (Determines Reactivity)

Metals that have a single valence electron and are extremely reactive.

Elements that are good conductors of electric current, and heat. Most R malleable and ductile

Elements with 7 valence electrons. All are highly reactive non-metals.

Elements that are less reactive with water compared to elements with one valence electron. 2 v

Elements with properties that fall between those of metals and non-metals.

Elements with a full outer shell. These elements do not react.

Each column in the periodic table.

Elements that are poor conductors of heat and electricity. Brittle.

The pattern of repeating properties in groups o the periodic table.