August 30-ch2 - Same number of protons Different number of...

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August 30, 2007 Biology-Ch2 What are atoms? Atoms are the fundamental structural units of matter and are composed of three types of particles o Atomic number is the number of protons in a nucleus An element is a substance that cannot be broken down by ordinary chemical reactions All atoms belong to one of 96 types of naturally occurring elements o The atomic number is the defining number of an element o Isotopes are variants of atoms
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Unformatted text preview: Same number of protons Different number of neutrons Some isotopes are radioactive Spontaneously break apart (decay) Used in research Elements may occur as solids, liquids, or gases at room temperature Larger atoms can accommodate more electrons than smaller ones can o More protons mean more electrons Electrons are distributed about that nucleus of an atom in electron shells...
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This note was uploaded on 04/10/2008 for the course BIOLOGY 101 taught by Professor Beitch during the Spring '07 term at Quinnipiac.

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