Elements and Compounds

1
Elements and Compounds

• 10/21/09

2
Element

• A substance that contains only one type of atom
• Example- Hydrogen, Oxygen, carbon, gold, copper,
  silver

3
Atoms make up ELEMENTS

• The protons in an Atom determines the kind of
  element it is
• Different elements contain different numbers of
  protons, neutrons and electrons.

4
How do you classify an Element?

• Elements can be classified by its
  characteristics.
• Metals (conducts electricity, and conducts heat)
• Nonmetals (doesnt conduct electricity)
• Metalloids /Semi-metals (can sometimes be a
  metal or a nonmetal (in between))

5
How are elements organized?

• We use the Periodic Table
• Periodic Table (it is a system to classify
  elements in an organized way)

6
How to read the periodic table?

• Hydrogen

Atomic Number (number of Protons)
Symbol
Name of element
Atomic Mass (how many protons and neutrons are in
the nucleus)
7
Name of Element
Atomic Number
Symbol
Atomic Mass
8
How many protons, neutrons and electrons are in
an atom?

• Atomic Number of Protons
• An atom wants to be stable so it also has the
  same of Electrons
• Atomic Mass of Protons of Neutrons

How many protons are in this element?
17 p
How many electrons are in this element?
17 e-
How many neutrons are in this atom?
18 n
Atomic Mass Protons Neutrons
9
What is a Compound?

• Compound- substance made of two or more elements
  together
• Example Salt, water, carbon dioxide

Hydrogen Atoms
Sodium atoms
Chlorine Atoms
Oxygen Atoms
10
Watch Video Clips

• Elements_and_Compounds1.asf
• Periodic_Table_of_the_Elements1.asf

11
Lets Label the Periodic Table

• Look at the periodic table
• Make a Key to help us understand how to read an
  element
• Color the Nonmetals
• Color the Metals
• Color the Metalloids

12
(No Transcript)