1. Elements
Not…
But…

2. Elements
An element is a _____ substance that cannot be separated or broken down into simpler substances by ________ or _________ means.
pure
physical
chemical
Examples of elements are:
hydrogen
oxygen
iron
silver
sulfur
silicon

3. If something is a _____ substance, it only contains one type of particle.
These particles are called ______.
pure
atoms

4. Elements
properties
Each element has a unique set of ________, that allow you to identify it.
These properties are called ____________ _________.
Density
Melting point and Boiling point
Freezing point
Reactivity with acids
Elements are classified by their properties. There are three major elemental groups:
Metals
Nonmetals
Metalloids
characteristic
properties

5. There are 3 major categories of elements.
1. Metals – shiny
conduct heat and electric current
malleable – can be flattened, rolled, or pounded into shapes

6. 2. Nonmetals – dull – not very shiny
Do not conduct heat or electric current
brittle – breaks when pounded

7. 3. Metalloids – have properties of both metals and nonmetals
Some are shiny and some are dull.
Some but not all conduct heat and electric current.

8. Major Categories of Elements
Metals
Nonmetals
Metalloids
shiny
good conductor of heat
good conductor of
electric current
malleable
ductile
examples: lead
copper
aluminum
dull (not shiny)
poor conductor of heat
poor conductor of
brittle and unmalleable
examples: sulfur
iodine
neon
semimetals
have properties of both
metals and nonmetals
some are shiny
some are dull
somewhat malleable
somewhat ductile
some conduct heat
some conduct electric
current
examples: boron
silicon
antimony

9. The Periodic Table of Elements