HS Physical Science

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Across
  1. 3. anything that has mass and takes up space
  2. 6. a particle in the nucleus with no charge
  3. 8. life, the time it takes for half of a radioactive sample to decay
  4. 9. an atom that has gained or lost electrons
  5. 11. a state of matter with definite shape and volume
  6. 13. the dense center of the atom
  7. 15. a high-energy state of matter with charged particles
  8. 17. a reaction between fuel and oxygen that produces heat
  9. 18. replacement, a reaction where two compounds exchange ions
  10. 19. a substance present at the start of a reaction
Down
  1. 1. the smallest unit of an element
  2. 2. a state of matter with no definite shape or volume
  3. 4. a negatively charged particle outside the nucleus
  4. 5. a positively charged particle in the nucleus
  5. 7. decay, when an unstable nucleus breaks down
  6. 10. a reaction where a compound breaks into simpler substances
  7. 12. atoms of the same element with different numbers of neutrons
  8. 14. a state of matter with definite volume but no definite shape
  9. 16. a substance made in a chemical reaction