Physics 0625 · IGCSE · Radioactivity

Radioactivity — practice question

An americium atom’s nucleus contains 146 neutrons and 95 protons. It decays by releasing an $\alpha$-particle. After this type of americium decay, how many neutrons and how many protons are left in the nucleus?

  • A142 neutrons, 93 protons
  • B142 neutrons, 95 protons
  • C144 neutrons, 93 protons
  • D144 neutrons, 95 protons

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