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Periodic Trends WebquestFor the past few days we've been studying trends on the periodic table. Ionization energy increases this way...electronegativity decreases that way...atomic radius gets bigger over there and smaller over here...Talk, talk, talk. That's all we've been doing. You listen to me, you write stuff down (maybe), and I keep my fingers crossed that you learn something. Today, however, your goal is to find the data to back up these mythical trends that I've been talking at you about.Your assignment is to use the internet resources found below to research each of the trends. This data should be entered into each of the blank periodic tables, and then you are to answer a few questions about each trend.Use the Recommended resources below to answer questions on Part 2 of this webquest, the trends: good interactive periodic table information on Atomic and Ionic trends about ionic radius trendschemviz/ionization/students/background.htmlA good, semi-visual explanation of how first ionization energies workchemed.chem.purdue.edu/genchem/topicreview/bp/ch7/ie_ea.htmlA very through explanation of how first ionization energy trends workPart I: Categories of Elements on the Periodic TableObjective: To discover the important sections of elements on the periodic table.Lesson: Go to and follow the links to answer the questions on your answer sheet.Periodic Table:What is a group? What is a period?Families - How are elements grouped into families?Metals – Approximately what % of elements do metals make up?Alkali metals - Who's in? Who's out? What are some properties of the alkali metals?Lanthanide Series (part of the inner transition metals) - Under "Meet the Family", what is unique about the actinide series?Halogens - How many electrons do halogens have in their valence energy levels? What do halogens like to react with?Inert gases (noble gases) - Why are they happy?Atomic RadiiDefine atomic radius:Which element has the greatest atomic radius? Smallest atomic radius?What is the trend in atomic radius from left to right across a period? Show trend on periodic table above with arrows. (use to then add in an arrow).What is the trend in atomic radius from top to bottom down a group? Show trend on periodic table above with arrows. (use insert to add in an arrow).Rationalize / explain this trend with respect to the nuclear attraction to the electron cloud. (look up in your notes or text or online if you need to!).Rationalize / explain this trend with respect to the nuclear attraction to the electron cloud. (look up in your notes or text or online if you need to!).Without looking at their atomic radii on the periodic table, try to organize the following elements in order of increasing atomic radius (Ge, He, Sr, O, Ba). *then check your answer using the p-table!Ionization EnergyDefine ionization energy:Which element has the greatest ionization energy? Smallest ionization energy?What is the trend in 1st ionization energy from left to right across a period? Show trend on periodic table above with arrows. (use insert to add in an arrow).What is the trend in 1st ionization energy from top to bottom down a group? Show trend on periodic table above with arrows. (use insert to add in an arrow)Rationalize / explain this trend with respect to the nuclear attraction to the electron cloud. (look up in your notes or text or online if you need to!)Without looking at their 1st ionization on the periodic table, try to organize the following elements in order of decreasing 1st ionization energy (Cs, F, Se, P, Ga).Click on Calcium. Use the sliding bar at the upper right corner of the periodic table to examine the 1st, 2nd, and 3rd ionization energies of calcium. Rationalize / explain the large jump in ionization energy from the 2nd to the 3rd ionization energy.Ionic RadiusDefine ionic radius?Which element has the greatest ionic radius? Smallest ionic radius?What is the general trend for ionic radius from left to right across a period? Show trend on periodic table above with arrows. (use insert to add in an arrow).What is the trend in ionic radius from top to bottom down a group? Show trend on periodic table above with arrows. (use insert to add in an arrow).Rationalize / explain this trend with respect to the nuclear attraction to the electron cloud. (look up in your notes or text or online if you need to!)Without looking at their atomic radii on the periodic table, try to organize the following elements in order of increasing atomic radius (Li, Cs, O, Al, F).Without looking at their atomic radii on the periodic table, try to organize the following elements in order of increasing atomic radius (K+1, N-3, S-2, Ba+2, F-1).ElectronegativityDefine electronegativity?Which element has the greatest electronegativity? Smallest electronegativity?What is the trend in electronegativity from left to right across a period? Show trend on periodic table above with arrows. (use insert to add in an arrow).What is the trend in electronegativity from top to bottom down a group? Show trend on periodic table above with arrows. (use insert to add in an arrow).Rationalize / explain this trend with respect to the nuclear attraction to the electron cloud. (look up in your notes or text or online if you need to!)Without looking at their electronegativity on the periodic table, try to organize the following elements in order of increasing electronegativity: Ca, Li, C, As, F.Provide an argument detailing why noble gases typically do NOT have electronegativity values. ................
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