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14 Cards in this Set
- Front
- Back
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Elements
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pure substance
cannot be broken down and maintain its properties |
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Elements composed of what 3 particles?
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Neutrons
Protons Electrons |
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What are the characteristics of a neutron?
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neutral charge,
contribute to the mass |
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What are the characteristics of a proton?
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positive charge,
contributes to the mass, never changes, identifies element equals # electrons |
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What are the characteristics of an electron?
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negative charge,
they may be lost and gained, gives atoms their properties equals # protons |
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Atomic Number equals the number of?
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Protons |
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Mass Number equation
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# neutrons + # protons
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An element with different # of neutrons?
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Isotopes
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The atomic mass (amu) is measured in?
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daltons
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Nucleus spontaneously “decays”
or Gives off particles & energy |
Radioactive isotope
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Neutrons and protons make up...
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the nucleus
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Who helped develop atomic theory
around 1800. |
John Dalton
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The smallest unit of matter
that still retains the properties of an element. |
atom |
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The time it takes for 50% of the parent isotope to decay.
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Half-life of the isotope
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