Regents Chemistry Period Unit 3: Atomic Structure. Unit 3 Vocabulary..Due: Test Day
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1 Name Skills: 1. Interpreting Mdels f the Atm 2. Determining the number f subatmic particles 3. Determine P, e-, n fr ins 4. Distinguish istpes frm ther atms/ins Regents Chemistry Perid Unit 3: Atmic Structure 5. Calculate WAAM! 6. Identify Valence Electrns and Electrn cnfiguratin 7. Draw Bhr Diagrams 8. Apply excited State electrn cncept t e- cnfiguratins Unit 3 Vcabulary..Due: Test Day Wrd Definitin Atm Prtn Neutrn Electrn Gld Fil Experiment Valence Electrn Atmic Mass Istpe In Anin Catin Excited State Principle Energy Level
2 Skill 1: Interpreting Mdels f the atm Travel thrugh the statins as yu travel in the time thrugh the evlutin f ur scientific understanding f the atm! Cmplete the activity and answer the questin fr each statin! Statin 1: The Greeks! An Atmic Philsphy What did Demcritus call the tiny, indivisible particle which he believed t be the basis f all substances? Plat and Aristle did nt with Demcritus and s his thery was centuries. Statin 2: Daltn (1803) What are the Daltn s three basic ideas are: 1. All substances are made f. 2. All atms f the same elements are but atms f ne element are different frm f all ther elements. 3. Atms cannt be int ther elements. 4. frm when atms f mre than ne element cmbine. Why d yu think we call this the Cannnball Thery? Or the Billiard Ball Thery? (Think abut the image abve and in the reading!) Statin 3: JJ Thmsn (1897): The Cathde Ray tube! Use the Magnet and write dwn what happens when yu bring the magnet near the beam: Watch link and answer: What particle did JJ Thmsn discver? What is the charge f this atm?
3 Statin 4: Rutherfrd (1909) Watch link 1 and use link 2 t answer: Describe the gld fil experiment: Rutherfrd s mdel f the atm tells us that mst f the atm is space. The atm has a small nucleus. With a POSTIVE CHARGE! Statin 5: The Bhr OR Planetary Mdel (1913) Watch and Answer: Negatively charged electrns are fund in cncentric arund the charged nucleus. We smetimes refer t the Bhr mdel as the _mdel. Electrns are fund at fixed rbiting at distances frm the nucleus. The path clsest t the nucleus has the energy level and the energy level is the farther the electrn is frm the nucleus Fllw Link and bserve the simulatin f the Bhr Mdel Statin 6: Wave mechanical/ Quantum Mdel (Mdern Mdel) Schrödinger used t describe the likelihd f finding an electrn in a certain psitin. This atmic mdel is knwn as the mdel f the atm. Unlike the Bhr mdel, the quantum mechanical mdel des nt define the f an electrn, but rather, predicts the dds f the lcatin f the electrn a clud. This lcatin is called an ORBITAL. Where the clud is mst dense, the f finding the electrn is greatest.
4 Practice: 1) Which f the fllwing did Rutherfrd s Gld Fil experiment prve? a. That the atm was a unifrmly dense sphere. b. That the atm is mstly empty space with a dense, psitive cre. c. That mst the atm cnsists f a unifrm psitive pudding with small negative particles called electrns embedded thrughut. d. Thatelectrnstravelarundthenucleusinwell-definedpathscalledrbits. 2) J.J. Thmsn s Cathde Ray Tube experiment led t the discvery f a. the psitively charged subatmic particle called the electrn b. the psitively charged subatmic particle called the prtn c. the psitively charged subatmic particle called the electrn d. the negatively charged subatmic particle called the electrn 3) Accrding t the Bhr Mdel, a. electrns are fund in areas f high prbability called rbitals b. electrns travel arund the nucleus in circular paths called rbits c. electrns are fund in areas f high prbability called rbits d. electrns travel arund the nucleus in randm paths called rbitals 4) Accrding t the Wave-Mechanical Mdel, a. electrns are fund in areas f high prbability called rbitals b. electrns travel arund the nucleus in circular paths called rbits c. electrns are fund in areas f high prbability called rbits d. electrns travel arund the nucleus in randm paths called rbitals 5) Write the charge n the fllwing subatmic particles: a. Prtn b. Neutrn c. Electrn 6) Draw a visual f the mdel: Greek/Daltn Thmsn Bhr Wave Mechanical
5 Name Perid Directins: Put the number f the definitin frm the list belw int the square with the apprpriate term. Check yur answers by adding the numbers t see if all the sums f all rws, bth acrss and dwn add up t the same number, the Magic #. Demcritus Daltn Thmsn Quantum Mdel Ttal _ Rutherfrd Prtn Atm Bhr Wave Mdel Neutrn Nucleus Alpha particle Electrn Mdel Energy levels Electrn clud _ Ttal _ Magic Number _ 1. Represented by a symbl; all are fund n the Peridic Table 2. Made a mental mdel f the atm; Greek philspher 3. Used by Rutherfrd in his experiment; made f tw prtns and tw neutrns 4. The paths in which electrns circle the nucleus accrding t the Bhr mdel 5. The psitive particle in the nucleus f an atm 6. The tiny psitive cre f an atm; cntains prtns and neutrns 7. Frmed the atmic thery mdel f the atm, cmmnly called Cannnball Thery 8. Discvered the nucleus using his gld fil experiment 9. Current explanatin f where electrns might be fund in the atm 10. Used by scientists t explain smething we cannt see r understand 11. The smallest particle f an element that has the prperties f that element 12. Anther name fr the wave mechanical mdel 13. Current mdel f the atm; prpsed by Schrdinger 14. Mass f prtns and neutrns 15. Develped the mdel f the atm in which electrns rbit the nucleus in energy levels 16. The negative particle that circles the nucleus 17. The neutral particle in the nucleus f an atm 18. Prpsed the plum-pudding mdel f the atm; discvered the electrn
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