1. Do Now What is an atom? What is an element? What is a molecule?
What is a compound?
Answer in complete sentences!
Can’t remember? Use your notes or your textbook.

2. Homework and Announcements
Textbook Pages: All questions and activities
Chapter 9 lesson 1 Vocabulary Chart (pg. 313)
USA TestPrep
Science Fair Projects – Due Friday
Complete (Pre-lab forms and Research Summary)

3. Title: Structure of an atom
L.O.: SWBAT describe the structure of an atom.

4. Compounds
Most elements in nature are found combined to other elements.
A compound is a pure substance made of two or more different elements chemically combined in a set ratio.
A compound may be represented by a chemical formula, which shows the elements in the compound and the ratio of atoms.
For example: H₂O The ratio of hydrogen atoms to oxygen atoms is 2 to 1.

5. Compound Review – Remember the Shells?
When elements are chemically combined, they form compounds having properties that are different from those of the uncombined elements.
Example
Calcium (solid) + Carbon (solid) + Oxygen (gas)
= Calcium Carbonate

6. What is an atom? Matter “stuff” Made up of compounds
Made up of elements
Made up of atoms
Atom
Basic particle of which all elements are made.

7. How big is a cell anyway. http://learn. genetics. utah

8. All atoms have the same basic structure with the same three components.
3 components of an ATOM
Protons
Neutrons
Electrons
What three particles make up an atom?
Share with the members of your group. p n

9. Where is each particle found?
Atom
Protons
Found in the center (or nucleus) of the atom.
Neutrons
Electrons
Found constantly moving around the nucleus. p n

10. What does an atom look like?+ +
NUCLEUS
(Protons and Neutrons)
CLOUD OF ELECTRONS
(electrons)

11. Draw and label the chart as shown below.
What are the three particles that make up an atom?
PARTICLE
SYMBOL
CHARGE
MASS
PROTON
NEUTRON
ELECTRON

12. Each component is has a symbol.
PARTICLE
SYMBOL
CHARGE
MASS
PROTON p+
NEUTRON n
ELECTRON e-

13. Each component can be categorized by their charge.
PARTICLE
SYMBOL
CHARGE
MASS +1
PROTON p+
NEUTRON n
ELECTRON e- -1

14. Each particle has a specific mass.
SYMBOL
CHARGE
MASS (amu)
PROTON p+ +1 1
NEUTRON n 1
ELECTRON e- -1
~ 0
(Nearly 0)

15. Pair-Share Proton, Neutron, or Electron
It is the particle of an atom represented by the symbol (n).
Neutron
It is the particle of an atom with no charge.

16. Pair-Share Proton, Neutron, or Electron
It is the particle of an atom with a mass of zero.
Electron
This particle has a charge of +1.
Proton

17. Pair-Share Proton, Neutron, or Electron
Name the two particles with a mass of 1(amu).
Proton and Neutron
It is the particle that is represented by the symbol e-.
Electron

18. Pair-Share Proton, Neutron, or Electron
It is the particle of an atom with a negative charge.
Electron
The two particles located in the nucleus of an atom.
Protons and Neutrons

19. In your notes, draw a model of the following...
Draw a model of an atom.
Label the following:
Protons
Neutrons
Electrons
Nucleus
e e
e e p n p

20. Summary
Write a paragraph (3-4 sentences) reflecting on today’s lesson.
What is an atom?
What makes up an atom?
What symbols are used to describe an atoms components?

21. Are you on task? Textbook pages 318-321 Answer all question/activities
Vocabulary Chapter 9 lesson 1 (Page 313)
Chapter 9 lesson 1 Vocab.
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