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15 Cards in this Set
- Front
- Back
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What is the atomic number for an element?
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The number of protons in the nucleus.
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What is the identifying characteristics of an atom?
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The atomic number because the number of protons in an atom never change.
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Describe the Quantum model.
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1) uses orbitals - like fuzzy clouds
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What is the Heinsburg uncertainty principle?
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It is impossible to know both the speed and position of an electron at the same time.
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All elements can be identified by their what?
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atomic number (number of protons in the nucleus)
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Protons have a charge of _____ and their mass is _______ times larger than an electron.
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+1
1,836 times larger |
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What is the atom mass number?
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It is the two particles that contribute to the mass of the atom (protons and neutrons)
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The atomic mass number is the sum of what two particles?
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The mass of the protons and neutrons make up the atomic mass number.
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________ and _____ are nearly the same in mass, so we can consider them equal.
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Protons and neutrons
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If the carbon atom has 6 protons, how many neutrons does it have ________? what is it's atomic mass number? __
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6 neutrons
atomic mass of 12 |
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If another atom of carbon has 6 protons and 7 neutrons, what would its atomic mass be?
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13
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What is an isotope?
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Atoms of the same element that have different numbers of neutrons.
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The isotope notation (example: Carbon-13) is indicating what?
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The 13 is indicating the atomic mass.
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What is the atomic mass of Uranium-234?
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234
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How can you determine the number of neutrons from an isotope notation?
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1) the notation indicates the atomic mass
2) get the atomic number from the periodic table 3) subtact the atomic mass from the atomic number to get the number of neutrons |
