Across
- 1. the breaking down of an element
- 3. a form of an element with a different number of electrons
- 4. Holds the orbiting electrons
- 6. made the plum pudding model
- 7. Contains the neutrons and protons in the atom
- 8. called the father of modern physics
- 10. has a proton number of 2
- 12. has medium penetration and ionisation
Down
- 2. the least penetrating and most ionising form of radiation
- 3. variation of an element with different number of neutrons
- 5. has a negative charge
- 9. how long it takes for an unstable element to decay by half
- 11. the most penetrating and least ionising form of radiation