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The Structure of Matter

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by Kristie Hellens on 18 September 2012

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Transcript of The Structure of Matter

RAD140
Principles of Radiographic Imaging I The Structure of Matter Relate the history of the atom.
Identify the structure of the atom.
Describe the electron shells and instability
with atomic structure.
Discuss radioactivity and the characteristics
of alpha and beta particles.
Explain the difference between two forms
of ionizing radiation. Objectives Greek atom
4 substances
4 essences Centuries of Discovery Dmitri Mendeleev Periodic Table of Elements Smallest part of the four substances of matter
Smallest particle of matter that has the properties of an element.
Subatomic particles are smaller that the atom
protons
neutrons
electrons Atom An element was composed of identical atoms that reacted the same way chemically Dalton Atom 8 Groups
Each block represents one element
Superscript = atomic number
Subscript = elemental mass Interpreting a Periodic Table Thomson Atom Bohr Atom Electron
Proton
Neutron Fundamental Particles
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