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A certain isotope X + contains 54 electrons and 78 neutrons. What is the mass number for this element?
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Aroller coaster car is traveling down a track at 22 m/s. the car has a mass of 2000 kg. what is the kinetic energy of the car? a) 22,000 j b) 968,000 j c) 484,000 j d) 44,000 j
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A certain isotope X + contains 54 electrons and 78 neutrons. What is the mass number for this elemen...
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