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25 Cards in this Set
- Front
- Back
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smallest particle of an element that retains the properties of that element |
atom |
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whose theory 1st lead to the fact that electrons move around the nucleus? |
Bohr |
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what observation of the particles in the gold foil experiment lead to the discovery of the nucleus? |
some particles deflected |
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Which atomic particles have the greatest & least mass in the atom |
greatest: neutron
least: electron |
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what subatomic particle determines the identity of an atom? |
proton |
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how to calculate the # of neutrons |
1) mass # - atomic #
2) mass # - p+ # |
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the # 87 in "Strontium-87" represents: |
atomic mass |
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True or false?
"the nucleus of an atom is positively charged and contains nearly all the mass of an atom" |
true |
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how many protons, neutrons, and electrons if: Atomic #: 70 Mass #: 200 |
p+: 70 n0: 130 e-: 70 |
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what % of mass of neon-22 is neutrons? |
n0: 22-10= 12
12/22= 0.545 x 100= 55% |
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most argon atoms have _____ neutrons |
22 |
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an O atom w/ 10 neutrons would be called |
Oxygen-18 |
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how many protons does Gold-197 have |
79 |
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how many electrons are in sulfide ion (S^-2) |
18 |
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an ion w/ 19 protons and 18 electrons would have what symbol |
K^+1 |
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how can you tell if elements are the same |
the atomic #/ proton # are the same (bottom #) |
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2 H has: 1 |
1 proton 1 neutron 1 electron |
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most hydrogen atoms are the isotope ________ and have ___ neutrons |
Hydrogen-1 0 |
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ions of the same element, such as 55Mn+2 and 55Mn+4 differ in : |
# of electrons charge |
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atom w/ 12 protons and 13 neutrons is called |
Magnesium-25 |
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mass # of Uranium-238? |
238.03 |
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true or false?
18O-2 has the same # of electrons as 21Na+ |
true |
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40Ti+4 has how many protons, neutrons, and electrons |
protons = 22 neutrons = 74 electrons = 54 |
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#s of protons, neutrons, & electrons in 127I- is: |
protons = 53 neutrons = 74 electrons = 54 |
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what is the symbol if it has 35 protons, 45 neutrons, & 35 electrons? |
80 Br 35 |
