The Fundamentals of Chemistry

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Across
  1. 1. a rare earth element.
  2. 5. less reactive than alkali metals.
  3. 6. when an atom loses an electron.
  4. 7. negatively charged, circle around the nucleus.
  5. 12. shows all possible locations of electrons
  6. 13. atomic mass unit
  7. 15. when an atom gains or loses one or more electrons.
  8. 16. the vertical rows on the periodic table.
  9. 18. have dull surfaces and cannot be shaped.
  10. 20. when an atom gains an electron.
  11. 22. almost never react, found in atmosphere.
  12. 23. very reactive, important for life.
  13. 24. a positively charged particle.
Down
  1. 2. the center of an atom, has protons and neutrons
  2. 3. very reactive,used to kill microorganisms.
  3. 4. when radiation decays something ?
  4. 8. an uncharged (neutral) particle.
  5. 9. when atoms have different numbers of neutrons.
  6. 10. in groups 3 and 12, copper,gold,etc.
  7. 11. elements that have a shiny look and conduct heat.
  8. 14. the number of protons within an element.
  9. 17. when atoms produce energy and particles.
  10. 19. have properties of metals and nonmetals.
  11. 21. the horizontal rows on the periodic table.
  12. 23. series 90-103