01 - Chemistry 1000 Lecture 1: Atoms Marc R. Roussel Atoms...

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Chemistry 1000 Lecture 1: Atoms Marc R. Roussel
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Atoms and subatomic particles I Atoms are mostly empty space. I Protons and neutrons occupy small, dense nucleus. I Electrons move around outside of the nucleus. I The proton and neutron are each more than 1800 times heavier than the electron. I Charge of proton = - (charge of electron) = e I A neutral atom has an equal number of electrons and protons.
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Atomic number and mass number Atomic number: Number of protons in the nucleus Symbol: Z Mass number: Total number or protons and neutrons in the nucleus Symbol: A
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Elements and isotopes Elements are characterized by a common value of Z . Isotopes have the same Z (same element) but different A . Notation: A Z E, e.g. 3 2 He or A E, e.g. 3 He
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Atomic mass unit: 1 12 of the mass of a single atom of 12 C Symbol: u I The mass in u is approximately equal to A . Example: The mass of an 16 O atom is 15.9949 u. I
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This note was uploaded on 03/03/2012 for the course CHEM 1000 taught by Professor Marc during the Fall '06 term at Lethbridge College.

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01 - Chemistry 1000 Lecture 1: Atoms Marc R. Roussel Atoms...

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