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An atomic nucleus A is composed of 84 protons and 128 neutrons. The nucleus A emits an α-particle and is transformed into a nucleus B. What is the composition of B? |
84 protons and 126 nuetrons 82 protons and 126 nuetrons 82 protons and 128 nuetrons 86 protons and 126 nuetrons |
82 protons and 126 nuetrons |
α-particle is helium with A = 4 and Z = 2. Nucleus B has 128-2 = 126 nuetrons and 84-2 = 82 protons. |
