This document provides instruction on determining atomic structure using the periodic table. It explains that the atomic number indicates the number of protons in the nucleus and is used to identify each element. The atomic mass can be used to calculate the number of neutrons by taking the rounded atomic mass and subtracting the atomic number. Electrons occupy energy levels around the nucleus and atoms aim to have an equal number of protons and electrons to achieve a net neutral charge.

1. 11/1/11 A/B Day
LEQ: How can we determine the structure
of an atom using the periodic table?
1. What is an atom?
2. What are the three particles (or parts) that atoms
are made of?
3. What is the difference between a proton and a
neutron?
4. What is the difference between a proton and an
electron?
5. What particles make up the nucleus of an atom?

2. Today’s LEQ:How can we determine the
structure of an atom using the periodic
table?
By the end of today, you should be able to…
1. Calculate the number of neutrons in an atom
2. Use the periodic table to draw models of atoms
3. Distinguish valence electrons

3. LET’S REVIEW!

4. Activating Strategy:

5. FOCUS VOCABULARY:
50. Atomic Number
51. Atomic Mass
52. Element
53. Energy Level

6. EXPLAIN TO A 3rd Grader:
How would we solve this word problem?
Together, Juan and Jordan have a total
of 48 cookies. Juan has 25 cookies.
How many cookies does Jordan have?
TOTAL: 48 cookies
Juan: 25 cookies
Jordan has 23 cookies

7. COPY THIS IN YOUR
NOTEBOOK! Atomic Number
(# of protons
7 in the
Element nucleus)
Symbol N
Nitrogen
14.01

8. What two particles make up the
nucleus?!

9. How can we determine the
total number of neutrons in Atomic Number
the nucleus?! (# of protons
7 in the
nucleus)
N
Nitrogen
14.01

10. Copy this in your notes!
Atomic Mass (Rounded)
Atomic Number
# of Neutrons
Below .5  Round DOWN
Above .5  Round UP

11. Let’s try it…. 1
Atomic Mass: 1.008
Rounded At. Mass: 1 H
Atomic Number: 1 Hydrogen
1 1.008
1
Number of Protons: 1
0 Number of Neutrons: 0

12. HYDROGEN:

13. Let’s try it…. 4
Atomic Mass: 9.012
Rounded At. Mass: 9 Be
Atomic Number: 4 Beryllium
9 9.012
4
Number of Protons: 4
5 Number of Neutrons: 5

15. Determining Atomic Structure:
How we tell the…
# of Protons:
# of Neutrons:
# of Electrons:

16. HOT Q: Atoms like to have a
total charge of 0 (or neutral).
Knowing that atoms have both
positive and negative particles
(protons and electrons), how can
they have a total charge of 0?

17. THEY HAVE AN EQUAL
NUMBER OF PROTONS
AND ELECTRONS!

18. In NORMAL ATOMS….
# of protons = # of electrons
Let’s practice:
Boron: 4 electrons
Helium: 2 electrons
Carbon: 6 electrons

19. Periodic Table: Independent Practice
Pg. R58 and R59 (back of the book!)

20. Why the weird shape?!

21. Helium Carbon
Sodium

22. Energy Levels: hold electrons with the same
amount of energy
1st Energy Level
2nd
3rd
DRAW THIS IN YOUR NOTES!

23. Drawing Electrons and Energy Levels: Helium
Protons: 2 WHAT NUMBER
Neutrons: 2 ROW IS IT IN?! 1
Electrons: 2

24. Drawing Electrons and Energy Levels: BORON
Protons: 5 WHAT NUMBER
Neutrons: 6 ROW IS IT IN?! 2
Electrons: 5

25. DRAW YOUR OWN!
Pick THREE elements and draw models of each of
them. You must choose ONE element from the first
energy level, ONE from the second energy level, and
ONE from the third energy level.
BE SURE TO:
LABEL each element you draw
DRAW “+” signs in your protons
INCLUDE the correct number of protons,
neutrons, electrons
DRAW electrons in their correct energy
level

26. Summarizer:
In 3-5 sentences, EXPLAIN how we can use the
periodic table to determine the structure of an
atom.
YOUR ANSWER MUST INCLUDE THESE WORDS:
PROTON ATOMIC MASS
NEUTRON ATOMIC NUMBER
ELECTRON ENERGY LEVEL