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26 Cards in this Set
- Front
- Back
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What are the three particles of an atom?
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Proton, Neutron, Electron
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What are the two parts of an atom?
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Nucleus, Electron Cloud
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What charge do electrons have?
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Negative
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What charge do protons have?
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Positive
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What charge do neutrons have?
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Neutral
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Atoms usually contain a ration of _ proton(s) to _ electron(s)
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one to one
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What is mass number?
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The sum of the masses of the protons and neutrons
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What is atomic number?
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The number of protons in an atom (and therefore usually electrons)
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How much mass does an electron have?
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1/1840 of a dalton (nearly zero, does not factor into mass number)
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How much mass does a proton have?
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1.007 of a dalton (1)
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How much mass does a neutron have?
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1.009 of a dalton (1)
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How many electrons are in the first energy level?
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2
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How many electrons are in the second energy level?
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8
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How many electrons are in the third energy level?
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18
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How many electrons are in the fourth energy level?
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32
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What is the formula for finding how many electrons can fit in an energy level?
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x=2n^2 where x is the amount of electrons and n is the energy level
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What letter represents the first energy level?
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K
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What letter represents the second energy level?
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L
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What letter represents the third energy level?
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M
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What letter represents the fourth energy level?
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N
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Isotopes have the ___ atomic numbers and ____ mass numbers
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Same, Different
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Atoms contain equal amounts of _____ and ______, which make them electrically ________.
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Protons(+), and electrons (-)
neutral |
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When an atom loses or gains an electron, it becomes a(n)______.
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Ion
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When an atom loses an electron does it become positive, negative, or remain neutral?
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Positive
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When an atom gains an electron, does it become positive, negative, or remain neutral?
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Negative
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The outer shell or energy level of an electron cloud is called the _____ ____.
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Valence Shell
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