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Chemistry

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Periodic Trends

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Three Important Periodic Trends Definition of Periodic Trend: The tendency of a certain characteristic of an element to increase or decrease as they progresses along a period or group on the periodic table of elements Definition of Term Atomic Radius - One half the distance between the nuclei of identical atoms that are bonded together. Picometers (pm) Ionization Energy - The energy required to remove 1 electron from a neutral atom of an element. kiloJoules per Mole (kJ/mol) Electronegativity - The measure of the ability of an atom in a chemical compound to attract the electrons of another atom in the compound. Trend Across the PT The atomic radii decreases as you move across each period, as you add more protons to help pull the electrons closer to the nucleus.

Test Bank for Chemistry

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July 19, 2009 [PROBLEM SET FROM R. CHANG TEST BANK] w w w . k a u . e d u . s a / a a s i r i 2 Page 1 Chapter 7 Quantum Theory and the Electronic Structure of Atoms Student: _____________________________________________________________________ 1. What is the wavelength of radiation that has a frequency of 6.912 ? 1014 s-1? A. 1.447 ? 10-15 nm B. 4.337 ? 102 nm C. 2.304 ? 106 nm D. 2.074 ? 1023 nm E. 4.337 ? 10-7 nm 2. What is the wavelength of radiation that has a frequency of 2.10 ? 1014 s-1? A. 6.30 ? 1022 m B. 7.00 ? 102 nm C. 7.00 ? 105 m D. 1.43 ? 10-6 m E. 3.00 ? 108 m 3. Calculate the frequency of visible light having a wavelength of 486 nm. A. 2.06 ? 1014 /s B. 2.06 ? 106 /s C. 6.17 ? 1014 /s D. 1.20 ? 10-15 /s

Periodic Table of Elements

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Group 1 2 ? 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Period 1 1 H 2 He 2 3 Li 4 Be 5 B 6 C 7 N 8 O 9 F 10 Ne 3 11 Na 12 Mg 13 Al 14 Si 15 P 16 S 17 Cl 18 Ar 4 19 K 20 Ca 21 Sc 22 Ti 23 V 24 Cr 25 Mn 26 Fe 27 Co 28 Ni 29 Cu 30 Zn 31 Ga 32 Ge 33 As 34 Se 35 Br 36 Kr 5 37 Rb 38 Sr 39 Y 40 Zr 41 Nb 42 Mo 43 Tc 44 Ru 45 Rh 46 Pd 47 Ag 48 Cd 49 In 50 Sn 51 Sb 52 Te 53 I 54 Xe 6 55 Cs 56 Ba * 71 Lu 72 Hf 73 Ta 74 W 75 Re 76 Os 77 Ir 78 Pt 79 Au 80 Hg 81 Tl 82 Pb 83 Bi 84 Po 85 At 86 Rn 7 87 Fr 88 Ra ** 103 Lr 104 Rf 105 Db 106 Sg 107 Bh 108 Hs 109 Mt 110 Ds 111 Rg 112 Cn 113 Uut 114 Uuq 115 Uup 116 Uuh 117 Uus 118 Uuo ? *Lanthanoids * 57 La

Chemistry Study Guide

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Ashley Hanson October 19, 2009 Biology Period 2 Study Guide- Ch 2- Chemistry of Life Answer the following questions with complete sentences, using examples/details to fully explain your answers.?You will get no credit if you do not give examples!!!!!!!!!! ????????????????????????????? (total points = 110) 1.?????? (2) What is the matter in organisms made of? 2.?????? (6) What 3 subatomic particles make up atoms? Explain a property or each one. 3.?????? (2) How are all of the isotopes of an element similar? different? 4.?????? (2) In what ways to compounds differ from their component elements? 5.?????? (8) What are the types of chemical bonds? Explain the similarities and differences between each one. 6.?????? (4) Explain the special properties of water that make it unique.

Lab 1 Density of solids Lab Conclusion

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Lab 1 ? Density of solids Lab Conclusion Mr. Grodski III Alexander Bedrossian Conclusion The objectives were completed: We measured the 4 objects & calculated their volumes; We calculated the density & identified the 4 unknown objects(Aluminum, Steel, Aluminum, Aluminum); And lastly we determined the accuracy of the results.

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