science study crossword

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Across
  1. 4. center of a atom
  2. 5. the opposite of metals
  3. 6. when an atom gains or loses more than one electron
  4. 9. metals metals with no melting point
  5. 10. when an atom produces particles
  6. 12. neutrally charged subatomic particles
  7. 14. rare earth metal
  8. 16. ions with one or more less electron
  9. 17. columns on the periodic table that share similar properties
  10. 18. negatively charged subatomic particle
  11. 20. rows on the periodic table
  12. 22. elements that conduct electricity and heat that are shiny
  13. 23. atoms of a element with different neutron counts
  14. 24. dense radioactive metallic elements
Down
  1. 1. gases that don't react to anything
  2. 2. positively charged subatomic particles
  3. 3. elements with metal and nonmetal properties
  4. 7. ion with one or more electron
  5. 8. very reactive non metals that can easily form compounds
  6. 11. when the atoms in a radioactive isotopes turn into different elements
  7. 13. area with the most possibility a electron is
  8. 15. how many protons an atom has
  9. 19. less reactive metal
  10. 21. unit for measuring atomic mass