Lecture2_Note

Lecture2_Note - Lesson 2 Atoms : The smallest particle of...

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1 Chapter 2 Atoms and Elements (2.1-2.6) 2008, Prentice Hall Lesson 2 Tro, Chemistry: A Molecular Approach 2 Atoms : The smallest particle of an element “retains the chemical properties” Mass is 10 - 27 g -- 10 - 24 g !! Atomic Structure Electron clouds Nucleus Neutron Proton 10 –15 m 10 –10 m Three subatomic particles Electrons : negatively charged particles Protons : positively charged particles Neutrons : uncharged particles Tro, Chemistry: A Molecular Approach 3 Relative Mass and Charge • We generally talk about the mass of atoms by the mass of a carbon atom with 6 protons and 6 neutrons, which we call 1 ü protons have a mass of 1amu ü electrons have a mass of 0.00055 amu, which is generally too small to be relevant ___________________ ______ Tro, Chemistry: A Molecular Approach 4 Atomic Mass/Weight amu: atomic mass unit 1 amu = of mass of 12 C atom mass of 12 C = 12.000 amu Atomic Mass 1 1 amu = 1 Dalton _________ _________ Tro, Chemistry: A Molecular Approach 5 Subatomic Particle Mass (g) Mass amu Location in atom Charge Symbol Proton 1.67262×10 -24 1.00727 nucleus +1 p, p + , H + Electron 0.00091×10 -24 0.00055
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This note was uploaded on 08/28/2008 for the course CHEM 116 taught by Professor Yokoyama during the Fall '08 term at SUNY Geneseo.

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Lecture2_Note - Lesson 2 Atoms : The smallest particle of...

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