Lec 04 29-8-05

Lec 04 29-8-05 - III Atoms A. Modern Atomic Structure (a...

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1 III Atoms A. Modern Atomic Structure (a quick review) 1. Protons and neutrons reside together in the nucleus at the center of the atom. 2. The nucleus makes up the bulk of an atom’s mass. 3. Electrons reside outside of the nucleus and define the size of the atom. a. most space is empty with negatively charged electrons moving around b. electrons have very small masses 2 a. 1. Cannot determine number of electrons without additional information. 2. The atom has 30 electrons. 3. The atoms has 15 electrons. 4. The atom has no electrons unless it is charged. 3 b. 1. The protons reside in the nucleus of the atom. 2. The protons are evenly distributed throughout the atom. 3. The protons are dispersed with the electrons around the nucleus. 4. The protons reside in a shell just outside the nucleus. 4 B. Isotopes 1. All atoms of an element have the same number of protons in the nucleus. 2. Isotopes are atoms with the same number of protons, but different numbers of neutrons. 3. An atom of a specific isotope is called a
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This note was uploaded on 03/12/2010 for the course CHEM 140 taught by Professor Ferrence during the Fall '08 term at Illinois State.

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Lec 04 29-8-05 - III Atoms A. Modern Atomic Structure (a...

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