lect_4oct3f08

lect_4oct3f08 - Outline 4 3-OCT-2008 Review Atomic...

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1 Outline 4 3-OCT-2008 1. Review Atomic Structure Evidence (Electrons, Nuclei, Protons, Neutrons), Symbols, Nuclides, Z, A ; A Z X; (ex: 2.18, definite composition) 2. Atomic mass SKILL: Get atomic mass from isotopic mass and fractional abundance. Examples 3. Periodic Table Periods and Groups
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2 Element - substance whose atoms all have same atomic number , Z. Atomic number ( Z ) - Number of protons in nucleus of atom = # electrons in neutral atom. Proton - nuclear particle with positive charge equal to that of e -’ s (“unit” charge) and mass more than 1800 times that of e - ’s. Review: Atomic Structure (1) Nuclear structure
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3 Mass number ( A ) - total number of protons and neutrons in nucleus. Neutron- nuclear particle with mass almost identical to that of proton, but zero electric charge . Table 2.2, p. 50, summarizes masses and charges of electrons, protons and neutrons . . Lookup! Know where to find this. Review: Atomic Structure(2) Nuclear structure
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4 Nuclide - atom characterized by definite atomic number and mass number. Shorthand notation for nuclide- symbol with atomic number ( Z ) as left subscript and mass number (A) as left superscript . Ex: 23 11 Na sodium-23 Na automatically means Z = 11. Z=11 automatically means Na. Review: Atomic Structure (3) Nuclear structure
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5 Review: Nuclide Notation Nuclide Notation - A Z X Symbol - first letter, capitalized, from name, sometimes with another lowercase letter from name . Ex: F, Ca, O. Some symbols come from name in another language (usually Latin).
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This note was uploaded on 02/18/2009 for the course CHEM 1A taught by Professor Okamura during the Fall '08 term at UC Riverside.

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lect_4oct3f08 - Outline 4 3-OCT-2008 Review Atomic...

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