Science Crossword Puzzle

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Across
  1. 3. very reactive non-metals that easily form compounds called salts
  2. 8. an element that has properties of both metals and nonmetals
  3. 9. a negatively charged particle located outside an atoms nucleus
  4. 10. very reactive, group 1 in the periodic table
  5. 13. a positively charged particle located in an atoms nucleus
  6. 14. an atom or group of atoms that has a positive or negative electric charge
  7. 15. equal to each proton or neutron
  8. 16. an element that is not a metal and has properties generally opposite to those of a metal
  9. 17. if an item loses an electron
  10. 18. valuable because they are radioactive
  11. 21. electrons, negatively charged particles, move within the nucleus
  12. 22. these are some of the earliest known elements, such as copper, iron, silver, gold
Down
  1. 1. if an atom gains an electron
  2. 2. a particle that has no electric charge and is located in an atoms nucleus
  3. 4. group 2 in the periodic table, not very reactive
  4. 5. the central region of an atom where most of the atoms mass is found in protons and nuetrons
  5. 6. almost never react with other elements
  6. 7. the process by which the nucleus of an atom element releases energy and particles
  7. 11. rare earth elements almost never react with other elements
  8. 12. an element that tends to be shiny, easily shaped, and a good conductor of electricity and heat
  9. 13. a horizontal row in the periodic of the elements
  10. 18. number the number of protons in the nucleus of an atom
  11. 19. a vertical column in the periodic table of the elements
  12. 20. an atom of one element that has a different number of neutrons than another atom of the same element