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15 Cards in this Set
- Front
- Back
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Daltons Atomic Theory
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the atom is the basic unit from which matter is constructed
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subatomic particles
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parts of the atom-protons, neutrons, and electrons
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Atoms
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Protons and nuetrons form the compact core of the atom called the nucleus, while electrons are dispersed in clouds around the nucleus. Atoms are mostly empty space.
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Characteristics of subatomic particles
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mass and charge
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Atomic mass units (amu)
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because the mass of a proton is so small it is measured in amu- protons and nuetrons each have a mass of 1 amu and the electron has a mass of 1/2000amu
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Protons
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Positive
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Neutrons
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Nuetral
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Electrons
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Negative
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Element
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descibes a substance that contains only one type of atom
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atomic symbol
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one or two letters to represent atom
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Human Body Mass
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mostly made of 64.6% oxygen (o), 18%carbon (c), 10%hydrogen (h), and 3.1% nitrogen (n)
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Atomic number
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is the number of protons in an atom's nulceus
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mass number
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the total number of protons and neutrons in the nulceus of an atom
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isotopes
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atoms of an element that have different numbers of nuetrons
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Elements
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elements in the same column belong in the same group
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