11/1/11 A/B DayLEQ: How can we determine the structureof an atom using the periodic table?1. What is an atom?2. What are the three particles (or parts) that atomsare made of?3. What is the difference between a proton and aneutron?4. What is the difference between a proton and anelectron?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 atom2. Use the periodic table to draw models of atoms3. Distinguish valence electrons
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 cookies Juan: 25 cookiesJordan has 23 cookies
COPY THIS IN YOUR NOTEBOOK! Atomic Number (# of protons 7 in theElement nucleus) Symbol N Nitrogen 14.01
What two particles make up the nucleus?!
How can we determine thetotal number of neutrons in Atomic Numberthe nucleus?! (# of protons 7 in the nucleus) N Nitrogen 14.01
Copy this in your notes!Atomic Mass (Rounded)Atomic Number# of Neutrons Below .5 Round DOWN Above .5 Round UP
Let’s try it…. 1Atomic Mass: 1.008Rounded At. Mass: 1 HAtomic Number: 1 Hydrogen 1 1.008 1 Number of Protons: 1 0 Number of Neutrons: 0
Let’s try it…. 4Atomic Mass: 9.012Rounded At. Mass: 9 BeAtomic Number: 4 Beryllium 9 9.012 4 Number of Protons: 4 5 Number of Neutrons: 5
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 EQUALNUMBER OF PROTONS AND ELECTRONS!
In NORMAL ATOMS….# of protons = # of electronsLet’s practice:Boron: 4 electronsHelium: 2 electronsCarbon: 6 electrons
Periodic Table: Independent PracticePg. R58 and R59 (back of the book!)
Why the weird shape?!
Helium Carbon Sodium
Energy Levels: hold electrons with the sameamount of energy1st Energy Level 2nd3rdDRAW THIS IN YOUR NOTES!
Drawing Electrons and Energy Levels: HeliumProtons: 2 WHAT NUMBERNeutrons: 2 ROW IS IT IN?! 1Electrons: 2
Drawing Electrons and Energy Levels: BORONProtons: 5 WHAT NUMBERNeutrons: 6 ROW IS IT IN?! 2Electrons: 5
DRAW YOUR OWN!Pick THREE elements and draw models of each ofthem. You must choose ONE element from the firstenergy level, ONE from the second energy level, andONE 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
Summarizer:In 3-5 sentences, EXPLAIN how we can use theperiodic table to determine the structure of anatom.YOUR ANSWER MUST INCLUDE THESE WORDS: PROTON ATOMIC MASS NEUTRON ATOMIC NUMBER ELECTRON ENERGY LEVEL