1. Matter & The Atom

2. Matter
The term matter describes all of the physical substances around us: your table, your body, a pencil, water, and so forth

3. Matter Anything that has mass and takes up space (has volume)
Made up of different kinds of atoms

4. Matter
Includes all things that can be seen, tasted, smelled, or touched
Does not include heat, sound, or light

5. Matter is made of atoms

6. Models
Models are often used for things that are too small or too large to be observed or that are too difficult to be understood easily

7. Models
In the case of atoms, scientists use large models to explain something that is very small
Models of the atom were used to explain data or facts that were gathered experimentally.
So, these models are also theories

8. Modern Model of the Atom The electron cloud
Sometimes called the wave model
Spherical cloud of varying density
Varying density shows where an electron is more or less likely to be

9. Atomic Structure
Nucleus
Protons
Neutrons
Electrons

10. Atomic Structure Protons -Much larger and heavier than electrons
positive charge (+)
Located in the nucleus of the atom 

11. Atomic Structure Electrons Tiny, very light particles
Have a negative electrical charge (-)
Move around the outside of the nucleus

12. Atomic Structure Neutrons Large and heavy like protons
Neutrons have no electrical charge
Located in the nucleus of the atom 

13. Draw the following picture on your output p.22.

14. Atomic Structure

15. Let’s look at the periodic table and determine what each square tells us!

16. Let’s Practice!- Output p.23 Please copy the table into CB
Element
#Protons
#Neutrons
#Electrons
Oxygen
Calcium
Aluminum
Tungsten
Nickel

17. Let’s Practice!- Output p.23 Please copy the table into CB
Element
#Protons
#Neutrons
#Electrons
Oxygen 8
16 – 8 = 8
Calcium 20
Aluminum 13
27-13=14
Tungsten 74
184-74=110
Nickel 28
59-28=31

18. Describing Atoms
# of protons
+ # of neutrons
Atomic mass number

19. Describing Atoms
Atomic Weight - average mass of the naturally occurring isotopes of an element .