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Atoms and Isotopes
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The Atom An atom is the smallest part of the element that still retains the properties of the atom. A crumb of the cake An element is matter made up of only one type of element.
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Atomic Structure Protons Neutrons Electrons
Positive, inside the nucleus, same size as a neutron p+ Neutrons Neutral, inside the nucleus, same size as a proton no Electrons Negative, outside the nucleus, much smaller e- Proton, neutron, electron
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Mass and Atomic Numbers
Atomic number = number of protons (#p+) Mass number = number of protons + number of neutrons (#p+ + #no) In a neutral atom # positives = # negatives #p+ = #e- Practice How many protons, neutrons, and electrons are in an atom of carbon-12? (what does the 12 represent here?) Mass number and atomic number
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Isotopes Isotopes are atoms of the same element that have different mass numbers. For example chlorine-35 and chlorine-37. How many protons does Cl-35 have? Cl-37? How many electrons do each have? How many neutrons do each have? What is the difference between the isotopes? isotopes
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Compare and Contrast Iron - 55 Iron - 56 practice
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Comparison Matrix Characteristics Charge Size Location proton
items to be compared Charge Size Location proton similarities differences electron neutron
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Independent Practice Finish Comparison Matrix
Atoms and Their IsotopesWorksheet
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