Electron Configuration “Lab” Purpose The purpose of this lab was to explore how electron configurations vary around the periodic table. The lab also helped us examine the relationships between electron configurations and reactions. Analysis The first pattern we discovered was that the sum of the superscripts equaled the number of electrons in the atom. Then‚ we learned that as you travel across the periodic table (starting from hydrogen up to the element of interest) the superscript increases
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friction is much weaker than sliding friction. • How did they come to be? The wheel was invented in prehistoric times; as the oldest example of a wheel yet found is from the region of Mesopotamia (Iraq)‚ so it may have been invented around the area where Iraq is today. The wheel may have been inspired by a simple observation of a rolling tree trunk‚ as the first wheels were indeed tree trunks. The next development was to use slices of these trunks joined together through an axle. Later‚ these wheels
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Qualitative Health Research http://qhr.sagepub.com Draw-and-Tell Conversations With Children About Fear Martha Driessnack Qual Health Res 2006; 16; 1414 DOI: 10.1177/1049732306294127 The online version of this article can be found at: http://qhr.sagepub.com/cgi/content/abstract/16/10/1414 Published by: http://www.sagepublications.com Additional services and information for Qualitative Health Research can be found at: Email Alerts: http://qhr.sagepub.com/cgi/alerts Subscriptions: http://qhr
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Chapter 5: Electrons In Atoms A. Models of the atom i. The Development of Atomic Models Protons and neutrons make up a nucleus surrounded by electrons Rutherford’s model or theory ( figured electrons move around the nucleus) His theory didn’t explain why metals or compounds of medals give off characteristics of colors when heated. Also didn’t explain why the atomic model could not explain the chemical properties of elements ii. The Bhor Model Bohr proposed that an electron is found in specific
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Electron Configuration Patterns WE CANNOT KNOW THE EXACT LOCATIONS OF ELECTRONS WITHIN ENERGY LEVELS‚ BUT WE CAN DESCRIBE PROBABLE REGIONS OF ELECTRON LOCATION. Our understanding of electron distribution is based on mathematical probabilities that result from knowledge about the behavior of charged particles in an atom: |a) | | |b) |
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The electron microscope‚ instrument that produced the first magnified image showing three-dimensional’ and highly magnified image of a small object. It directs a beam of electrons rather than light through a specimen. The beam of electrons is created from an electron gun. This beam then travels through the length of the microscope cylinder‚ which contains the lenses‚ the specimen chamber‚ and the image-recording system. Two types of electron lenses are used‚ electrostatic and electromagnetic
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The Discovery Of The Electron The electron was discovered in 1895 by J.J. Thomson in the form of cathode rays‚ and was the first elementary particle to be identified. The electron is the lightest known particle which possesses an electric charge. Its rest mass is Me <approximately equal> 9.1 x 10 -28 g‚ about 1/1836 of the mass of the proton or neutron. The charge of the electron is -e = -4.8 x 10^-10 esu <elec trostatic unit). The sign of the electron’s charge is negative by convention‚ and
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like to read news of new free drawing lessons as they occur and as the pages are updated (no more often than weekly!) NEW John Hagan CD now available! COWDISLEY HOME SITE Peek into a corner of the John Hagan studio ...! http://www.geocities.com/~jlhagan/K9-14/introduction.htm [08.12.2002 12:36:41] Learning to draw - lesson notes for teachers LESSON NOTES FOR TEACHERS LEARN HOW TO DRAWEssential and elementary lessons on learning how to draw for 9-14year olds who have interests in becoming;
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Scroll bar Things you can do with Bezier Tool 1. Trace Bitmap 2. Draw curves 3. Edit Bezier Pen Tool - A variation of Bezier Tool - Used to draw straight lines and curves - Lines and curves are always visible *Shift – new lines are constrained to specific angles *Ctrl or Alt – used to switch to edit mode Polyline Tool – used to create lines that combine straight and freehand tool styles. 3-point curve – lets you draw a curve by defining the start‚ end and center point. Complex Shapes
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Study Guide 1. Write down the electron configuration for the following atoms (see page 135 in your textbook): Mg Ne Zn 2. Which elements have the following electron configurations? a. 1s22s2 b. 1s22s22p63s23p1 3. Sketch the shape of the following orbitals: s p d 4. Define the term “quantum.” 5. Using the diagram of the atom‚ on the right‚ identify the following: a. Which arrow(s) indicate that electrons absorbed energy? b. Which arrow(s) indicate that electrons lost/emitted energy as light
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