Across
- 3. deriving destructive energy from the release of atomic energy
- 6. is a chemical change which forms new substances
- 7. samples of an element with different numbers of neutrons in their atoms.
- 8. is periodic table of the elements, since having the full energy level presents the properties of a noble gas.
- 9. is the smallest constituent unit of matter that has the properties of a chemical element
Down
- 1. is a particular kind of homogeneous matter
- 2. the most common isotope of the element hydrogen, with one proton, one electron
- 4. is the largest object within our solar system, comprising 99.8% of the system’s mass.
- 5. whose symbol is ²H, is a stable isotope of hydrogen found in nature
- 10. is a natural isotope of hydrogen; it is radioactive. Its symbol is ³H.