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Atoms – The Inside Story
Class NotesTuesday, Sept. 14, 2010
What are atoms?
• Smallest ‘building blocks’ of matter– Matter is anything that has mass and takes up
space• Most mass in an atom is contained in the
middle, called the nucleus• Atoms are composed of 3 different parts:– Protons (+)– Neutrons (0)– Electrons (-)
Where are these particles found in the atom?
• Different theories and atomic models have been tested by many scientists over hundreds of years, but we now think:– Protons are found in the nucleus– Neutrons are found in the nucleus– Electrons are probably found moving around in an
area surrounding the nucleus, called the electron cloud
Atom Concept Map
Particles that make up
atoms
Proton
Positive
Neutron
Neutral
Electron
Negative
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