science test guide- Ari

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Across
  1. 2. a substance forms when an atom gains or loses an electron.
  2. 4. element with properties of metals and non-metals.
  3. 5. very reactive nonmetals.
  4. 7. row of the periodic table.
  5. 11. the central region of an atom
  6. 13. uncharged particle.
  7. 14. process of which elements produce energy and particles.
  8. 16. action around the nucleus.
  9. 17. a reactive metal-element.
  10. 19. the process of which atoms change.
  11. 20. elements that conduct electricity or heat and have a shiny appearance.
  12. 21. piece of an atom that determines the atomic number.
Down
  1. 1. extremely reactive element that must be stored in oil.
  2. 3. an element that does not react with other substances.
  3. 6. number of protons in the nucleus.
  4. 8. less reactive metals
  5. 9. atomic mass unit.
  6. 10. an atom with more protons than electrons.
  7. 12. elements with the opposite properties of metals.
  8. 15. result of an atom gaining an electron.
  9. 18. an atom that has the same number of protons and electrons, but a different number of neutrons.