The periodic table of elements
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The Periodic Table of Elements. Matter. Anything that has mass and takes up space Everything in the universe that you can see is made up of some type of matter All matter is made of elements. Element.

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The Periodic Table of Elements

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The periodic table of elements

The Periodic Table of Elements


Matter

Matter

Anything that has mass and takes up space

Everything in the universe that you can see is made up of some type of matter

All matter is made of elements


Element

Element

A pure substance (only one type of atom/particle) that cannot be separated into simpler substances

http://learn.genetics.utah.edu/content/begin/cells/scale/

118 in 2012

98 can be found in nature

Example: Carbon

All others man-made in a laboratory

Example: Einsteinium

Each element is unique, but may share properties with other elements


Discovering a pattern

Discovering a Pattern

In the 1860s no one had organized the known elements

A pattern appeared when Dmitri Mendeleev arranged element cards in order of increasing atomic mass

Elements with similar properties occurred in a repeating pattern


3 categories of elements

3 Categories of Elements

Metals

Non-metals

Metalloids


Metals

Metals

Most elements are metals

Located to the left of the zigzag line

Most are solid at room temperature


Non metals

Non-Metals

Located to the right of the zigzag line

More than half are gases at room temperature


Metalloids

Metalloids

Border the zigzag line


Each square includes

Each Square Includes …

Atomic number (top left corner)

Chemical symbol (same worldwide)

Element’s name

Atomic mass (below the element’s name)


Decoding the table

Decoding the Table

Each row (left to right) is a period. There are 7.

Each column (top to bottom) is a family/group. There are 18.

Elements in the same family often have similar properties.


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