Physics 9702 · AS & A Level · SI units

SI units — practice question

The number of electrons in a neutral atom of the isotope of plutonium, $^{{239}}_{{94}}\text{Pu}$, is altered to form a charged atom (ion) W. W carries a total charge of $+1.6 \times 10^{-19}\text{ C}$. How many protons, neutrons and electrons are present in W?

  • Aprotons 94, neutrons 145, electrons 93
  • Bprotons 94, neutrons 145, electrons 95
  • Cprotons 238, neutrons 94, electrons 239
  • Dprotons 239, neutrons 94, electrons 238

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