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5.2.3a Radioactive decay

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Question 13

A thorium nucleus 90230Th^{230}_{90}\text{Th}90230​Th decays to form radium by emitting an α\alphaα-particle. Radium decays to actinium by emitting a β\betaβ-particle.

Which option gives the atomic number and mass number of this isotope of actinium?

A

Atomic number: 89, Mass number: 226

B

Atomic number: 88, Mass number: 226

C

Atomic number: 89, Mass number: 230

D

Atomic number: 87, Mass number: 226

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5.2.3a Radioactive decay Questions

  1. IGCSE
  2. /Physics
  3. /5.2.3a Radioactive decay

120 exam-style questions on CIE IGCSE Physics 5.2.3a Radioactive decay. Each one has a worked solution and a mark scheme showing where the marks go.

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