Chemistry 3 Wednesday, August 30, 2006

Chemistry 3 Wednesday, August 30, 2006 - mass number = # p...

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Wednesday, August 30, 2006 Chemistry A TOUR OF THE PERIODIC TABLE - What and where are the subatomic particles? - How many are in an atom? - What info does the table give? Text: Sections 1.8 (3 rd part) – 1.10 “Navigating the periodical Table”/Website THE NUCLEAR ATOM 1. Rutherford – Gold Foil Experiment a. Expect: go straight through α – particles He 2+ 10,000 mi/s Source Most Mostly empty space Go ~all mas contained in Straight nucleus Through Rutherford Some deflect + A few bounce back Found: 1 in 20,000 bounce back Conclude: something heavy 2. New model of the atom -“nucleus” contains +charge and ~ all mass in atom 3. Subatomic particles Particle Charge Mass Proton (p + ) +1 ~ 1 amu Neutron (n 0 ) 0 ~ 1 amu Electron (e - ) -1 ~ .0005 amu
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Wednesday, August 30, 2006 IONS AND ISOTOPES 1. Periodic Table entry 17 Atomic Number a. Atomic # = # of protons in nucleus Cl i. Defines an element 35.453 2. Atom Ion Neutral Charged #p + = #e - #p + /=/ #e - Ex. Cl Ex. Cl 1- Cation: + charged Anion: - charged 3. Mass Spectrometry Power - - + Cl 1- containing sample + deflection depends on charge/mass ratio
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Unformatted text preview: mass number = # p + + #n Charge Mass Mass # #p+ #n0 #e-Abundance-1 36.94 amu (37 = (17 + 20)) 18 24%-1 34.97 amu (35 = (17 + 18)) 18 76% 4. Isotopes a. Same element, different mass b. Ex. 37 Cl 1-, 35 Cl 1-Example How many p + , n , e-in 54 Cr 3+ ? p + n e-24 30 21 Write symbol for species containing: 38 p + , 49 n , 36 e- 87 Sr 2+ 5. Mass on Periodic Table a. Average atomic mass i. Weighted average b. molar mass ( note two scales) Wednesday, August 30, 2006 PERIODIC TABLE- ORDERING 1. Mendeleeve-1869 a. Ordered elements by mass and props Ar vs. K Holes for Ga, Ge 2. Today: ordered by atomic # 3. Navigation the table PERIODIC LAW Arranged by atom #, elements exhibit periodicity in their properties (elements grouped by properties) GOALS 1. Describe the nuclear atom 2. Determine a. #p= b. #n0 c. #e-d. Symbol 3. navigate the periodic table 4. match name and symbol of first 36 elements (no numbers)...
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This note was uploaded on 03/20/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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Chemistry 3 Wednesday, August 30, 2006 - mass number = # p...

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