science

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