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14 Cards in this Set
- Front
- Back
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Atoms
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the smallest unit of an element that has the properties of that element
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Element
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a substance made of identical atoms
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Structures of an element
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nucleus-center of the atom
protons- positive charge- 1 atomic mass unit neutrons- no charge- 1 atomic mass unit electron cloud- a series on concentric spheres electrons- negative charge- 1/1600 atomic mass unit |
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A neutral atom
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a. the number of protons equals the number of electrons
b. the atomic mass of the atom is the number of protons plus the number of protons plus the number of neutrons |
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Isotope
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atoms of an element with different numbers of neutrons but the same number of protons
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Ions
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atoms that have lost or gained electrons
gain electrons- negative charge lose electrons- positive charge |
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covalent bond
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form when two or more atoms share electrons
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ionic bond
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occurs when one atom donates electrons to another atom
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Bohr model
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2-D representation of an atom also called "solar system model"
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Electrons
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negative charge- 1/1600 atomic mass unit
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Protons
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positive charge- 1 atomic mass unit
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Nucleus
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very small center core of an atom
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Neutrons
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Particle of an atom thats neutral
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Atomic Number
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# of protons in the nucleus of every atom
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