Beta Science
Mr. McMartin
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.
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.
Each element has it’s own “characteristic
Characteristic properties include:
 Physical properties
 Boiling point
 Melting point
 Density
 Chemical properties
 Reactivity with acid
 flammability
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.
Physical Properties
Chemical properties
Elements are grouped into categories by the
properties they share.
There are three major categories:
 Nonmetals
 Metalloids
Categories are similar but they have distinct
qualities. Much like music may be similar but
they have categories like: pop, rock, classical
They are Malleable and Ductile
Nonemetals are elements that are dull and that
are poor conductors of heat and electric
Nonmetal solids tend to be brittle and
unmalleable. Few familiar objects are made of
only nonmetals.
Metalloids are also called “semiconductors.”
They have properties of both metals and non
Some are shiny. Some are dull
They are somewhat malleable and ductile.
Some metalloids conduct heat and electric
current well.
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