1. 9/29 OBJECTIVES (from yesterday):
Atoms! (Week 5)
9/29 OBJECTIVES (from yesterday):
1. Define and distinguish atom, element, molecule, compound, and matter.
TASK:
What is an atom? Please write your answer in a complete sentence or two. (on notes)

2. About That Test… Mean: ~80 Range: 43-100
Corrections: Thursday is best. Next Tuesday also good.

3. Biochemistry
My Favorite!
Super-cool introductory video

4. Atoms are small
An atom is the smallest piece of an element that is stable under normal conditions.
All matter is made up of atoms

5. (almost) Everything is made of atoms!
Sugar

6. Even You and Every Other Living Thing are Made up of Atoms.
Matter: anything that has mass and takes up space.
Keratin is a protein that is made of matter.
Everything except energy is made up of matter

7. How small? …and 1 cell is made up of about 100,000,000,000,000 atoms
1 human is made up of about 100,000,000,000,000 cells!

8. Atoms are Ridiculously Small
A MILLION atoms in a straight line would be as thick as a single human hair!!!
The radius of a carbon atom is only 0.22 nm

9. Good thing Science has Powerful Microscopes!
Each bright spot is a single atom

10. Elements: substances made up of only 1 type of atoms
An element is a substance made up of only 1 type of atom.
Only silver atoms in here!

12. Water is a compound made of oxygen and hydrogen atoms.
Compounds
Compounds are pure substances made of more than one type of atom, joined together
Water is a compound made of oxygen and hydrogen atoms.

13. Different Elements = Different Atoms
Atoms of different elements are different from one another because they have different numbers of protons, neutrons, and electrons.

14. Molecules A molecule is the smallest piece of a compound.
Wally the Water Molecule says: “If I get broken down any farther, I won’t be water anymore… I’d just be a mixture of hydrogen and oxygen!”
Wally

15. Parts of an atom: Label the diagram
Atoms contain 2 parts:
The atomic nucleus contains protons and neutrons
Electrons fly around the nucleus near the speed of light

16. Atom’s radius = 170 pm Nucleus’ radius = 0
Atom’s radius = 170 pm Nucleus’ radius = pm 105 = 5 orders of magnitude.
Fruit Fly length = m Camden Yard’s radius = 150 m 105 = 5 orders of magnitude.

17. Atoms Atoms are made of three particles: Protons Neutrons Electrons
Positive Charge
In Nucleus
Neutrons
No Charge
Electrons
Negative Charge
Outside of Nucleus in Electron Cloud
Have Negligible (zero) Mass

18. Wait…Electron Cloud?

19. Electrons are seemingly everywhere at once!
We cannot pinpoint electrons to one given spot at one given moment – they move too fast
They are PROBABLY found in various energy levels around the outside of the nucleus:

20. We’ll Deal more With Electrons Tomorrow…
For now, EXIT TICKET!