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20 Cards in this Set
- Front
- Back
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name the components of an atom:
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-Nucleus (protons + neutrons)
-Electrons |
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Describe the unit charge of an electron
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-Is a negative unit of charge
-1.6 x 10^-19 Coulombs |
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What does A mean in the formula for an element?
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-Mass number
-number of nucleons (neutrons + protons) |
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What does Z mean in the formula for an element?
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-Atomic number
- number of protons in the nucleus (or number of electrons outside the nucleus) |
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What is an isotope?
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-SAME # of PROTONS but
-DIFFERENT # of NEUTRONS |
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What is an isotone?
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-SAME # of NEUTRONS
-DIFFERENT # of PROTONS |
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What is an isobar?
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-SAME # of NUCLEONS
-DIFFERENT # of PROTONS |
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What is an isomer?
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-SAME # of PROTONS AND NEUTRONS
-DIFFERENT nuclear energy states |
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Define atomic mass unit (amu)?
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-masses of atoms and atomic particles are given in terms of amus.
-1/12 of the mass of a C-12 atom, a carbon isotope. |
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1 amu = how many kg?
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1 amu = 1.66 x 10^-27 kg
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Define mass defect
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-when the nucleus is formed, a certain mass is destroyed and converted to energy which keeps the nucleons together.
-this mass difference is the mass defect. |
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Define electron volt (eV)
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- the kinetic energy acquired by an electron in passing through a potential difference of 1 V.
- is a unit of energy in atomic and nuclear physics. |
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Describe the distribution of orbital electron model proposed by Niels Bohr:
-Electrons revolve around the ______ in specific _____ and are prevented from leaving the atom by the _________ force of attraction between the ____ charged nucleus and the _____ charged electrons. |
-nucleus
-orbits -centripetal -positively -negatively |
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What is the innermost orbit or shell called?
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K shell
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Name the shells in order from innermost to outermost:
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K-L-M-N-O
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The maximum number of electrons in an orbit is given by:
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2n^2
-n is the orbit number |
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Describe the decay scheme of Co-60?
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-first emits a particle, B-
-then emits packets of energy, photons. |
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What is the equation for velocity
What are the units for veloctiy? units for wavelength? units for frequency? |
velocity(c) = frequency(v) x wavelength (lambda)
-meters/second -meters -cycles/seconde (hertz) |
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What is the quantum model?
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-The amount of energy carried by a packet of energy, or photon
-it relates the energy of a photon with its frequency of oscillations by: E=hv - h=plank's constant |
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What is energy (E) measured in?
What is plank's constant? |
-Joules (J)
- h=6.62 x 10^-34 J-sec |
