Unit 4 vocabulary: periodic table

Front

**Metalloids**

Back

Found along the 'staircase'. Have properties of both metals and nonmetals.

Front

**Nonmetals**

Back

Elements on the right side of the periodic table, poor conductors, gain electrons when forming ions.

Front

Periodic Table

Back

A chart of all chemical elements currently known, organized by their properties.

Front

**Element**

Back

Contain only one type of atom with the same number of protons.

Front

**Periods**

Back

Horizontal rows on the periodic table. Number equals the number of energy levels in the atom.

Front

**Groups**

Back

Vertical columns on the periodic table that have common properties. Tells the number of valence electrons.

Front

**Metal**

Back

Shiny, malleable, ductile and good conductors. On the left side of the periodic table.

Front

**Alkali Metals**

Back

Very reactive, not found alone in nature, react violently with water. Group 1 elements.

Front

Alkaline Earth Metals

Back

Hard, grey-white, good conductors of electricity, calcium and magnesium are examples. Group 2 elements.

Front

Lanthanides

Back

The first period below the periodic table, they are mixed with more common metals to form alloys.