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Chemistry 121, Week 3 Notes

by: Brigette Honaker

Chemistry 121, Week 3 Notes 121

Marketplace > University of North Dakota > Chemistry > 121 > Chemistry 121 Week 3 Notes
Brigette Honaker

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About this Document

These notes cover the third week of class.
General Chemistry I
Dr. David Pierce
Class Notes
Chemistry, structure of atoms, avagadoros number
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This 2 page Class Notes was uploaded by Brigette Honaker on Friday October 14, 2016. The Class Notes belongs to 121 at University of North Dakota taught by Dr. David Pierce in Fall 2016. Since its upload, it has received 3 views. For similar materials see General Chemistry I in Chemistry at University of North Dakota.


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Date Created: 10/14/16
Week Three Wednesday, September 7, 2016 2:28 PM September 7th, 2016 Structure of Atoms (1.7-1.8)  Subatomic particles o Proton: positive charge (-e = 1.602 x 101C)  Protons differentiate atoms from one another  Atomic number = number of proton o Neutron: no charge  Neutrons are important in isotopes  Isotope: atoms that have extra neutrons  Having additional neutrons in a nucleus can change the reactivity, usually making the isotope unstable.  Ex) carbon-13 = carbon atom with an-19omic mass of 13 o Electron: negative charge (e = -1.602 x 10 C)  Nucleus o Dense center made of protons and neutrons o Approximately 10 -1m  Electron cloud o Occupied by electrons o Approximately 10 -1m  Balanced atoms will have the same number of protons and electrons.  Protons differentiate atoms from one another o Atomic number = number of protons  Example: 84Kr has how many protons, neutrons, and electrons? o Protons = 36 o Neutrons = 84 - 36 = 48 48 o Electrons = 36  Classroom Question: Name the isotope with 13p and 14n o Aluminum-27 Avogadro's Number (1.8)  Aka the mole 23  Measures the amount of a substance that contains 6.022 x 10 atoms  The atomic mass on the periodic table is the average molar mass (M) in grams.


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