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12 Cards in this Set
- Front
- Back
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Atoms of the same element but having different numbers of neutrons & thus different masses are called....
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isotopes
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Why aren't mass numbers on the periodic table whole numbers?
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The average of all the masses of the isotopes doesn't calculate to a whole number.
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In isotope shorthand, there is a top and a bottom number. Which one identifies the element?
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The bottom number. It's the number of protons
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In isotope shorthand, there is top and a bottom number. What must you do to determine the number of neutrons?
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Top number minus bottom number
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If an isotope has 10 protons and 11 neutrons, then what are the top and bottom numbers in the shorthand?
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21 on top
10 on bottom |
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Top number says that it has "zero" mass
Bottom number says its charge is -1 |
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Top number says it has a mass of 1 unit.
Bottom number says it has zero charge. |
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Proton
(1-1 = 0 neutrons) |
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146 neutrons (238 - 92 = 146)
92 protons |
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U-238
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Bottom number 92 identifies it as Uranium.
It has 235 nucleons (143n + 92p = 235) |
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Bottom numbers are different (different numbers of protons)
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