Chapter 4 – Elements,
Compounds, and Mixtures
Section 1 - Elements
Elements


Are a pure substance
Can NOT be broken into a simpler
substance physically or chemically
Pure substances



Have only one type of particle
Particles are called atoms
All atoms are EXACTLY the same
Characteristic Properties


Characteristics do not depend on the
amount of the element
Physical characteristics:


Boiling point, melting point, density,
etc
Chemical characteristics:

Reactivity with acid, flammability, etc.
Identifying Elements


Elements are unique
May share some properties with other
elements, but not ALL properties
Metals




Shiny
Conduct heat energy
Conduct electric current
Ex: iron, nickel, cobalt
Nonmetals




Do not conduct heat energy
Do not conduct electric current
Solid nonmetals are dull looking
Ex: iodine, sulfur, neon
Metalloids


Have properties of both metals and
nonmetals
Ex: silicon, boron, antimony