1. Beta Science Mr. McMartin
Elements
Beta Science
Mr. McMartin

2. Vocabulary
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 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. Properties of Elements
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. Properties of Elements Cont.
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. Other physical/chemical properties
Physical Properties
Color
Hardness
Texture
Chemical properties
Flammability
Reactivity

7. Classifying Elements by Properties
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. Metals Characteristics
They are Malleable and Ductile

9. Nonmetals Characteristics
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 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.