Potassium-39 and potassium-41 are naturally occurring stable isotopes of potassium.
Nuclei of potassium-39 and potassium-41 can be represented by these symbols:
39K19and41K19 {}^{39}\text{K}_{19} \quad \text{and} \quad {}^{41}\text{K}_{19} 39K19and41K19Complete the table for a neutral atom of potassium-39 and a neutral atom of potassium-41.
| Number of neutrons in the nucleus | Number of electrons in orbit around the nucleus | |
|---|---|---|
| potassium-39 | ||
| potassium-41 |
81 exam-style questions on Edexcel GCSE Physics 6.1 Atomic structure and isotopes, covering 6.1.1 Structure of the atom, 6.1.2 Isotopes: atomic and mass number, 6.1.3 Sub-atomic particles: masses and charges, and 6.1.4 Electron orbits and energy changes. Each one has a worked solution and a mark scheme showing where the marks go.