CHEM Notes Jan 20th
CHEM Notes Jan 20th CHEM 1004
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This page Class Notes was uploaded by Nadyah Hilmi on Sunday January 24, 2016. The Class Notes belongs to CHEM 1004 at George Washington University taught by Zysmillich in Spring 2014. Since its upload, it has received 103 views. For similar materials see Contemporary Science for Non-Science Majors in Chemistry at George Washington University.
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Date Created: 01/24/16
Chemistry for NonScience Majors Wednesday january 20 Class Notes ATOMIC STRUCTURE Proton NUCIEUSI Elm a f xx Neutrnu kil if if Exx xx 0 Where all mass is condensed Nucl ug If x 3 Elem Composed of 2 particles l o Protons charge 1 I I g I I mass 100 amu K I f f o Neutron charge 0 mass 3 asdx f 100 amu c1xquot Cloud contains electrons o Electrons charge 1 mass 0005 amu Representation of an atom 0 Mass number number of protons the element surntnnl 0 Atomic number total carhun number of particles in nucleus protons massnumher iAX gment EI mPIEI l 5C alumil number i2 neutrons 0 As long as the number of protons is to the number of electrons the charge is zero neutral C39 0 Lewis Dot Representation 0 Only includes mm 39 o Valence electrons interact with the environment 1St energy level contains 2 Valence I EIEEtI EH IS electrons 2 0393rOI energy level contains 8 electrons I czre e ec I39OHS PERIODIC TABLE ORGAIZATION Elements arranged by increasing atomic number of protons Elements with similar chemical properties fall in the same column groups same of valence electrons Elements in same row period have same number of core electrons and same number of energy levels CHEMICAL BONDING Octet rule atoms tend to gain lose or share electrons until they are surrounded by 8 elections 0 All elements want 8 electrons in the valence shell 0 When the element completes the valence shell they become stable lonic Bond Metal non metal Ha GI Illa GI39 Sodium atom Chlorine atom Sodium ion Chloride ion k aoation an anion A Sodium chloride Neill CoDWghl 3931 Pealson Education Inc publishing as Beniemin Cummings O O n e atom loses an electron in ionic bonds 0 When Na loses an electron the charge of Na is 1 and the charge of Cl is 1 0 Charged atoms lons Positive cation Negative anion o lsoelectric lons held together by electrostatic interactions Covalent Bond 2 or more non metals 0 The atoms come togethe share electrons 0 Double bonds Use lines to represent covalent bonds oTrip bonds V I 1 quot i 39 Wu Hi 1 3 In l r Ii II Oxygen Molecule 02
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