1. The Building Blocks of Matter: Atoms- - - + + + + - - + + - - -

2. Matter Anything that has mass and takes up space (volume) Examples:
A brick has mass and takes up space
A desk has mass and takes up space
A pencil has mass and takes up space
Air has mass and takes up space
All of the above examples are considered matter because they have mass and take up space. Can you think of anything that would not be considered matter?

3. Atoms
Smallest possible unit into which matter can be divided, while still maintaining its properties.
Made up of:
protons
neutrons
electrons - + - + + - + + - -

4. Atoms are so small that…
it would take a stack of about 50,000 aluminum atoms to equal the thickness of a sheet of aluminum foil from your kitchen.
if you could enlarge a penny until it was as wide as the US, each of its atoms would be only about 3 cm in diameter – about the size of a ping-pong ball
a human hair is about 1 million carbon atoms wide.
a typical human cell contains roughly 1 trillion atoms.
a speck of dust might contain 3x1012 (3 trillion) atoms.
it would take you around 500 years to count the number of atoms in a grain of salt.
C-C-C-C-C-… + 999,995 more
1 trillion atoms  .
Is made of approximately 3 trillion atoms
Just one of these grains

6. Just What Size Is an Atom?
Let’s do a little exercise!!
What you’ll need
A strip of paper
A pair of scissors
What to do
Cut a strip of 11 in. paper in half.
Discard one half.
Cut the remaining piece in half.
Continue cutting and discarding the strips as many times as you can.
Make all cuts parallel to the first one. When the width gets longer than the length, you may cut off the excess, but that does not count as a cut.

7. Just What Size Is an Atom?
Cut 1
Pocket
Hand
14 cm

8. Just What Size Is an Atom?
Cut 2
Finger
Ear
7.0 cm

9. Just What Size Is an Atom?
Cut 3
Watch
Mushroom
Eye
3.5 cm

10. Just What Size Is an Atom?
Cut 4
Keyboard Key
Ring
Insect
1.75 cm

11. Just What Size Is an Atom?
Cut 5
Keep going … atoms are much smaller!
0.88 cm

12. Just What Size Is an Atom?
Cut 6
Tiny seeds on top of a Whopper bun
0.44 cm

13. Just What Size Is an Atom?
Cut 7
Keep going … atoms are still much smaller!
0.22 cm

14. Just What Size Is an Atom?
Cut 8
Thread
1.0 mm

15. Just What Size Is an Atom?
Cut 9
It’s too difficult to keep cutting!
Let’s just pretend from now on
0.5 mm

16. Just What Size Is an Atom?
Cut 10
The size of one tiny light (pixel) on a computer screen
0.25 mm

17. Just What Size Is an Atom?
Cut 11
Wow, I didn’t think anything was this small!
0.125 mm

18. Just What Size Is an Atom?
Cut 12
A piece of hair
0.06 mm

19. Just What Size Is an Atom?
Cut 13
Our meter has disappeared!
???
0.03 mm

20. Just What Size Is an Atom?
Cut 14
The thickness of paper
0.015 mm

21. Just What Size Is an Atom?
Cut 15
We’re not done yet keep cutting!
0.007 mm

22. Just What Size Is an Atom?
Cut 16
Bacteria
0.003 mm

23. Just What Size Is an Atom?
Cut 17
We’re not done yet keep cutting! mm

24. Just What Size Is an Atom?
Cut 18
Water filter
1.0 micron

25. Just What Size Is an Atom?
Cut 19
We’re not done yet keep cutting!
0.5 micron

26. Just What Size Is an Atom?
Cut 20
Tiny wires inside a computer chip
0.25 micron

27. Just What Size Is an Atom?
Cut 21
We’re not done yet keep cutting!
0.13 micron

28. Just What Size Is an Atom?
Cut 22
Virus
0.07 micron

29. Just What Size Is an Atom?
Cut 23-25
We’re not done yet keep cutting!
0.03 micron

30. Just What Size Is an Atom?
Cut 26
Almost there
5 Cuts left
0.004 micron

31. Just What Size Is an Atom?
Cut 27
Almost there
4 Cuts left
0.002 micron

32. Just What Size Is an Atom?
Cut 28
Almost there
3 Cuts left
0.001 micron

33. Just What Size Is an Atom?
Cut 29
Almost there
2 Cuts left
micron

34. Just What Size Is an Atom?
Cut 30
Almost there
1 Cut left
micron

35. Just What Size Is an Atom?
Cut 31 H Ca He
Atoms !!! Cl C Na O N
micron

37. How Many Atoms Are In A Person?
Around …
8,000,000,000,000,000,000,000,000,000
that’s …
eight million-million-million-million-thousand atoms
Wow!