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
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
A pure substance (only one type of atom/particle) that cannot be separated into simpler substances
118 in 2012
98 can be found in nature
All others man-made in a laboratory
Each element is unique, but may share properties with other elements
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
Most elements are metals
Located to the left of the zigzag line
Most are solid at room temperature
Located to the right of the zigzag line
More than half are gases at room temperature
Border the zigzag line
Each Square Includes …
Atomic number (top left corner)
Chemical symbol (same worldwide)
Atomic mass (below the element’s name)
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.