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THE PERIODIC TABLE WEBQUEST!!Answer the questions on the following pages using the information on the websites provided.ON THE SHOULDERS OF GIANTSCLICK HEREComplete the following table using information from the website above.Scientist Contribution to the development of the periodic tableGreek thinkers about 400 BCused the words ‘element’, and ‘atom’ to describe the differences and smallest parts of matter.Lavoisier:first extensive list of elementsHe distinguished between metals and non-metals, dividing the few elements known in the 1700's into four classesJohn Daltonmade atoms even more convincing, suggesting that the mass of an atom was it's most important property.Doberiner He noted that similar elements often had relative atomic masses, grouping elements in ‘triads’.DechancourtoisThe periodic law, however, appears to have been independently formulated by at least six people within one decade - De ChancourtoisCannizaroStanislao Cannizaro determined atomic weights for the elements known in the 1860s,NewlandsThe eighth element, starting from a given one, is a kind of repetition of the first", which Newlands called the Law of Octavesnd arranged the table.MeyerBoth Meyer and Mendeleev constructed periodic tables independently that are credited as being the basis of the modern table. Meyer was more impressed by the periodicity of physical properties, while Mendeleev was more interested in the chemical properties.MendeleyevMendeleev constructed periodic tables independently that are credited as being the basis of the modern table. Mendeleev also published his periodic table & law in 1869, but he also forecast the properties of missing elements, and chemists began to appreciate it whenMoseleyLater, the table was reordered by Mosely according to atomic numbers (nuclear charge) rather than by weight, thereby modifying the Periodic Law.SeaborgInto the 1930s the heaviest elements were being put up in the body of the periodic table, and Glenn Seaborg "plucked those out" while working with Fermi in Chicago, naming them the Actinide series, which later permitted proper placement of subsequently 'created' elements - the Transactinides, changing the periodic table yet again. These elements were shown separate from the main body of the table.GETTING THE LAY OF THE LAND: PERIODICALLY ORGANIZEDClick here to learn more.1. Why are the elements placed in specific places on the Periodic Table? The elements are placed in specific locations because of the way they look and act2. Periods are ___elements_____ that run from ___left____ to _right______.3. Elements in the same period have something in common.______________________.4. Every element in the first period has __1______ shell for its _outershell______. Every element inthe second period has ______2____ for its _____outershell______. See the pattern?5. Groups are ___elememts____ that run from __top____ to __bottom_______.6. The elements of a group have the same number of _____electrons_______ in their ____outer_______shell.7. Every element in group one has ______1___ electron in its outer shell. Every element ingroup two has _______2____ electrons in its outer shell.8. Hydrogen is special because it can act like two groups, _____1_____ and ____7_____.9. Hydrogen sometimes is __missing____________ an electron and sometimes it has an________extra_____ electron.10.Although helium has only ___2_______ electrons in its outer shell, it is grouped withelements that have ________8________.11. The green elements on this table are called _____nonmetals_______ elements. They each have two electrons in their outer shell.GETTIN'' TOGETHER WITH THE FAMILIES!!!!Use this site to fill in the blanks below:http.//12. Click on Alkali Metals (left bar) and answer the following questions.a. What is the group number? _____1A_____b. Are these metals reactive? _______yes___c. Do these metals occur freely in nature? __no________d. How many electrons are in their outer shell? ____1_______e. What are the three characteristics of ALL metals? _malleable, ductile, and are good conductors of heat and electricityf. Are these metals soft or hard? ___softer _____________________g. Name the two most reactive elements in this group?_Cesium_________ and _francium_________h. What happens when they are exposed to water? ____explode________________13. Click on Alkaline Earth Metals (left bar) and answer these questions.a. What is the group number? second__________b. Are these metals reactive? ____yes very______c. Do these metals occur freely in nature? __no__________d. How many electrons are in their outer shell? _2________ (Hint: It’s the same as their oxidationnumber or group number.)14. Click on Transition Metals (left bar) and answer these questions.a. How many elements are in this group? _38___________b. What are the group numbers? 3__________ through 12_______c. What are valence electrons? __they use to combine with other elementsd. Because the valence electrons are present in more than one _shell____________ transition metalsoften exhibit several common _______oxidation states___________.e. Name the three elements in this family that produce a magnetic field. ___iron, cobalt, and nickel15. Click on Other Metals (left bar) and answer these questions.a. How many elements are in this group? ____7__________b. What are the group numbers? __13_______ through ___15_______c. How are these other metals similar to the transition metals? ductile and malleabled. How are these metals different than the transition metals? _ do not exhibit variable oxidation states_______________________________________________________________e. List three physical properties of these other metals. are solid, have a relatively high density, and are opaquef. What are the oxidation numbers for this group? _ +3, ±4, and -3_____________________16. Click on Metalloids to answer these questions.a. On your periodic table, draw the black stair-step line that distinguishes metals from nonmetals. This line is drawn from between Boron and Aluminum to the border between Polonium and Astatineb. Metalloids have properties of both _metals_______ and _____non-metals________.c. Define semiconductor ____ metalloids, such as silicon and germanium_______________________________.d. Name two metalloids that are semi-conductors. _silicon__and _______germanium___.e. This property makes metalloids useful in __ computers and calculators17. Click in Nonmetals to answer these questions.a. What are the group numbers?14_ through ____16________b. List four characteristics of ALL nonmetals. not able to conduct electricity or heat very well. As opposed to metals, non-metallic elements are very brittle, and cannot be rolled into wires or pounded into sheets. c. What two states of matter do nonmetals exist in at room temperature?____ gases (such as oxygen) and solids (such as carbon).d. The nonmetals have no no metallic luster, and do not reflect light e. What are the oxidation numbers of the nonmetals? _ ±4, -3, and -2. 18. Click on the Halogens (left bar) to answer these questions.a. What is the halogen group number? ____17_______________b. Are halogens metals or nonmetals? __nonmetals____________________c. The term “halogen” means ____salt-former________________ and compounds containing halogens arecalled ____________salts________.d. How many electrons are in their outer shell? _____7_____________e. What is their oxidation number? ______-1________________f. What states of matter do halogens exist in at room temperature?__________solid,liquid, and gas________________________19. Click on Noble Gases (left bar) and answer these questions.a. What is the group number? ___18______________b. Why were these gases considered to be inert or stable? _______All noble gases have the maximum number of electrons possible in their outer shell (2 for Helium, 8 for all others), making them stable.c. What is their oxidation number? _0___________________20. Click on Rare Earth Elements ( Inner Transition) (left bar) and answer these questions.a. On you periodic table, label the Lanthanide and Actinide series with your pencil.b. How many Rare Earth elements are there? ___30________________________c. Define trans-uranium. element of the lanthanide series and most of the elements in the actinide series are called trans-uranium, which means synthetic or man-made. d. The Rare Earth metals are found in group _3 of the periodic table, and the 6th and 7th periods. ................
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