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Beta Science Mr. McMartin.  Element: a substance that cannot be separated or broken down into simpler substances by chemical or physical means.  Pure.

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Presentation on theme: "Beta Science Mr. McMartin.  Element: a substance that cannot be separated or broken down into simpler substances by chemical or physical means.  Pure."— Presentation transcript:

1 Beta Science Mr. McMartin

2  Element: a substance that cannot be separated or broken down into simpler substances by chemical or physical means.  Pure Substance: a sample of matter, either a single element or a single compound, that has definite chemical and physical properties.  Metal: an element that is shiny and that conducts heat and electricity well  Nonmetal: an element that conducts heat and electricity poorly.  Metalloid: an element that has properties of both metals and nonmetals.

3  Elements are “pure substances.”  Each element contains only one type of atom.  Ex. Every atom in a 5g nugget of the element gold is like every other atom of gold.  The particles of a pure substance are alike no matter where they are found.

4  Each element has it’s own “characteristic properties.”  Characteristic properties include:  Physical properties  Boiling point  Melting point  Density  Chemical properties  Reactivity with acid  flammability

5  An element may share a property with another element, but other properties can help you tell the elements apart.  Ex. Helium and krypton are both unreactive gases but their densities are different. Helium is less dense than air, while krypton is more dense than air.

6  Physical Properties  Color  Hardness  Texture  Chemical properties  Flammability  Reactivity

7  Elements are grouped into categories by the properties they share.  There are three major categories:  Metals  Nonmetals  Metalloids  Categories are similar but they have distinct qualities. Much like music may be similar but they have categories like: pop, rock, classical etc.

8  They are Malleable and Ductile

9  Nonemetals are elements that are dull and that are poor conductors of heat and electric current.  Nonmetal solids tend to be brittle and unmalleable. Few familiar objects are made of only nonmetals.

10  Metalloids are also called “semiconductors.”  They have properties of both metals and non metals.  Some are shiny. Some are dull  They are somewhat malleable and ductile.  Some metalloids conduct heat and electric current well.


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