Periodic Table

The way the Periodic Table is organized tells us about the elements.

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​The horizontal rows are called periods.

​The period number tells us how many shells an atom has.

All the elements that are LEFT of the stair step line are metals, except hydrogen.
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All the elements that are RIGHT of the stair step line are nonmetals, as well as hydrogen.
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The elements along the stair step line are metalloids.
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Metals and nonmetals can be broken into smaller groups, based on their properties and location on the periodic table. We will only look at a few of these.

All the elements in the first group (except hydrogen) are alkali metals. They are VERY reactive.
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All the elements in the second group are alkaline earth metals. They are really reactive, but not as much as alkali metals.
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All the elements in the 17th group are halogens. They are VERY reactive.
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All the elements in the 18th group are noble gases. They are unreactive.
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All the elements in the middle section are transition metals. These are "typical" metals like gold, iron, copper.
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