Periodic Table and Elements

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**Metalloids**

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

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**Nonmetals**

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

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Periodic Table

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

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**Element**

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

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**Periods**

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

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**Groups**

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

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**Metal**

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

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**Alkali Metals**

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

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Alkaline Earth Metals

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

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Lanthanides

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