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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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