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?
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11/1/11 A/B DayLEQ: 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?
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
LET’S REVIEW!
Activating Strategy:
FOCUS VOCABULARY:
50. Atomic Number51. Atomic Mass52. Element53. Energy Level
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 cookiesJuan: 25 cookies
Jordan has 23 cookies
7
NNitrogen
14.01
Element Symbol
Atomic Number(# of protons
in the nucleus)
Element NameAtomic Mass
(total # of
particles
in the nucleus)
COPY THIS IN YOUR NOTEBOOK!
What two particles make up the nucleus?!
7
NNitrogen
14.01
Atomic Number(# of protons
in the nucleus)
Atomic Mass
(total # of
particles
in the nucleus)
How can we determine the total number of neutrons in the nucleus?!
Copy this in your notes!
Atomic Mass (Rounded)Atomic Number# of Neutrons
Below .5 Round DOWNAbove .5 Round UP
Let’s try it…. 1
HHydrogen
1.008
Atomic Mass: Rounded At. Mass: Atomic Number:
110
1.00811
Number of Protons: Number of Neutrons:
10
HYDROGEN:
Let’s try it…. 4
BeBeryllium
9.012
Atomic Mass: Rounded At. Mass: Atomic Number:
945
9.01294
Number of Protons: Number of Neutrons:
45
Determining Atomic Structure:
How we tell the… # of Protons:
# of Neutrons:
# of Electrons:
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?
THEY HAVE AN EQUAL NUMBER OF PROTONS
AND ELECTRONS!
In NORMAL ATOMS….
# of protons = # of electronsLet’s practice:Boron: Helium:Carbon:
5 electrons
2 electrons
6 electrons
Periodic Table: Independent Practice
Pg. R58 and R59 (back of the book!)
Why the weird shape?!
Helium
Sodium
Carbon
Energy Levels: hold electrons with the same amount of energy
1st Energy Level
2nd
3rd
DRAW THIS IN YOUR NOTES!
Drawing Electrons and Energy Levels: Helium
Protons: Neutrons:Electrons:
222
WHAT NUMBER ROW IS IT IN?! 1
Drawing Electrons and Energy Levels: BORON
Protons: Neutrons:Electrons:
565
WHAT NUMBER ROW IS IT IN?! 2
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 drawDRAW “+” signs in your protonsINCLUDE the correct number of protons, neutrons, electronsDRAW electrons in their correct energy level
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 MASSNEUTRON ATOMIC NUMBERELECTRON ENERGY LEVEL
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