1. Warm Up….complete the Venn diagram on p 13 of your notebook Activity
Date
Session #
Activity
Page #
9/20, 25
Subatomic Particle Calculations 16
Subatomic Information on the Periodic Table -Notes 17
Bohr Model & Lewis Dot Practice 18
Bohr Model & Lewis Dot Diagram Rules 19
Homework:
Study for Quiz: States of matter, Atomic structure, Periodic table cells
Bring M&M’s or skittles

2. Compare and contrast protons, neutrons and electrons.
Neutrons electrons

3. 8.P.1 Understand the properties of matter and changes that occur when matter interacts in an open and closed container. 8.P.1.1 Classify matter as elements, compounds, or mixtures based on how the atoms are packed together in arrangements.

4. TLW calculate atomic structure using notes, summarizing demonstrations and completing atom family periodic table cells.

5. Bringing it all together… For example, OXYGEN is an element on the periodic table. It is made of only one type of atom
Actual Oxygen Atom
Oxygen on the Periodic Table

6. Atomic Number = number of protons
PERIODIC TABLE CELLS
Atomic Number = number of protons
atomic ID #
In neutral atoms:
number protons =
number electrons
this is an average

7. CO ≠ Co SYMBOL RULES: ELEMENTS START WITH A CAPITAL LETTER
Any other letters in the symbol are lower case…Just like when you write your name
Co ≠ CO !!
this is an average
CO ≠ Co

8. Comparing protons, neutrons & electrons
P 7 middle section
Comparing protons, neutrons & electrons
Mass demonstration (this is text!!)
The mass of an atom is….
Based on the demonstration, what can you conclude about the relationship between an atom’s mass and its subatomic particles?
EVIDENCE
I saw, I noticed….
INTERPRETATION
I wondered, connected, inferred, concluded…

9. Atomic Mass = number of protons + number of neutrons
this is an average

10. Are Units Important?
So what units should we use when describing the mass of an proton, or neutron or electron?

11. How far is it from Charlotte to San Diego?

12. How far is it from Charlotte to San Diego?
3,835,000,000 mm OR 150,990,000 inches 2,385.3 miles

13. So what units should we use when describing the mass of an proton, or neutron or electron?

14. 1 proton = x lb = lb 1 electron = × 10−30 lb lb

15. Atomic Mass Units…just for atoms!
Protons = 1 amu Neutrons = 1 amu Electron mass insignificant …0. (their charge and configuration are VERY IMPORTANT, not their mass)

16. In your notebook, on the paper under the note sheet on page 8
To find the number of Neutrons:
Round the Atomic Mass to a whole number
Atomic Mass – Atomic Number=NEUTRONS
P + N P = N
Nucleus protons = neutrons

17. p 8
Atomic Number = Protons = Electrons Mass - Atomic Number = Neutrons
I am a chemistry maniac!
KING KONG
CHEMISTRY
Guided Practice: have the students use the EOG copy of the periodic table to find: an element given its atomic number, the number of protons in a specific element, the number of electrons in an element/atomic number, an element with X neutrons. Candy rewards???
Quick Quiz!!!

18. P 7
Use your notes and the periodic table at your seat, complete the following worksheet

19. P 7

21. How are subatomic particles arranged?
Bohr Model of the atom:
All of the protons and the neutrons
The 3rd ring can hold up to 8 e-
10P
11N
The 1st ring can hold up to 2 e-
The 2nd ring can hold up to 8 e-
***once a ring is full, it will not give up any electrons in the full ring

22. Valence electrons determine:
how an atom bonds with other atoms (or if it will bond at all).
atom’s reactivity (how easily it bonds with other elements.)
Atoms with a complete set of valence electrons are stable. They don’t bond with other atoms: don’t gain/lose electrons, don’t share electrons.
Word origin/stem
late Middle English: from late Latin valentia ‘power, competence,’ from valere ‘be well or strong.’
P 10

23. Draw Bohr models (atomic models) for
P 9
As a class:
B (Boron, element 5)
Na (Sodium, element 1)
On your own:
O (Oxygen, element 8)
Li (Lithium, element 3)

24. (because the others are in full rings and aren’t going anywhere)
Lewis Dot Structures
The behavior of an atom is determined by the VALENCE ELECTRONS…so wouldn’t it be easier to just draw those??
(because the others are in full rings and aren’t going anywhere)
Write the symbol for the element
Calculate the number of valence electrons (Use dots to represent the electrons.)
Place electron “dots” around the symbol, starting on the left and moving clockwise.
Begin by placing only one electron dot per side of the element symbol.
More than 4 valence electrons? Add the second dot to each side (clockwise)
Max of two electron dots per side