Describe the composition and structure of a neutral atom of lithium-7, which has a proton number of 3 and a nucleon number of 7.
A radioactive isotope decays by β\betaβ-emission to form an isotope of nickel with nucleon number 65.
| Element | Symbol | Proton number |
|---|---|---|
| cobalt | Co\text{Co}Co | 27 |
| nickel | Ni\text{Ni}Ni | 28 |
| copper | Cu\text{Cu}Cu | 29 |
| zinc | Zn\text{Zn}Zn | 30 |
| gallium | Ga\text{Ga}Ga | 31 |
| germanium | Ge\text{Ge}Ge | 32 |
Use data from the table to write down the nuclide equation for this decay.
484 exam-style questions on CIE IGCSE Physics 5.2 Radioactivity, covering 5.2.1 Background radiation and measuring count rate, 5.2.2a Alpha, beta and gamma emission, 5.2.2b Deflection and ionising effects of nuclear radiation, 5.2.3a Radioactive decay, 5.2.3b Effects of decay on the nucleus and decay equations, 5.2.4a Half-life, 5.2.4b Choosing isotopes for applications, and 5.2.5 Effects of ionising radiation and safety precautions. Each one has a worked solution and a mark scheme showing where the marks go.