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OpenStudy (anonymous):
If an atomic nucleus spontaneously emits two protons and two neutrons, then a(n) __________ particle has been emitted. a. alpha b. beta c. gamma ray d. neutron
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sam (.sam.):
What element consist of two protons and two neutrons?
OpenStudy (maddyx):
should be an alpha particle. You see, the mass number has decreased by 4 ( 2 for proton and 2 for neutron) and atomic number has decreased by 2 (for 2 protons). it is definitely alpha particle.
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